Funny math
Sunday, July 16th, 2006.
- From eglobe1.
Did you know crystal structures can be categorized into seven mathematical crystal systems? Any student can access links to photographs of beautiful crystals. These same crystals can also be used for these beautiful corporate awards for businesses. They also offer crystal gifts for anyone who likes more of a personalized decoration and also offering more of a personal touch.
@ haha.nu
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(348 votes, average: 4.76 out of 5). 
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July 16th, 2006 07:23
I can’t stop to laugh… VERY FUNNY! Where you find them?
July 16th, 2006 09:26
me too. cant stop laughting. so funny!
July 16th, 2006 13:49
Anyone care to explain the two right triangles, one with the hole, problem to me? Not even a cup of coffee has helped me figure out what went wrong here. All of the shapes appear to be equivalent in triangle one and non-triangle two, but non triangle two obviously is one square unit smaller in area, but of course that’s impossible. AARGH!
I also think the solution to 1/n(sin x) = ? is hilarious and ingenius, seems too clever to be real imo, this isn’t even an equation, there is know way to determine the values of n and x. You would have to know the values of n and x already to get an answer, in which case the oddly creative and intuitive maneuvers to create the word six would be unneccesary. There is a certain elegance to this silly answer that makes me think it was made up. It is a clever manipulation of symbols. If a student did actually do this, and wasn’t trying to be funny, I think this was a brilliant attempt at trying to solve a problem with no comprehension whatsoever. This student should be good at math.
In conclusion, chuckling at math jokes makes me feel extremely nerdy, and the fact that I don’t get one of them is embarassing. I can’t win.
July 16th, 2006 13:52
#5 isn’t funny, alot of the rest are.
July 16th, 2006 14:34
For the two triangles, take a piece of paper and put it across the hypotenuse. You will note that one triangle is slighly concave and the other convex — it’s an optical illusion.
July 16th, 2006 14:46
Yeah, for the triange one, the slopes of the hypotenuses (hypotenes? hypoteni?) of the 2 trianges is different. The first triange’s hypotenuse has a slope of 3/8 and the other one 2/5.
July 16th, 2006 14:52
In Q5 ABC is not a triangle in the first place. The red and green triangles are not similar (as seen by the gradients 2/5 != 3/8).
As a result wo non-triangular shapes are being compared which have a difference in area along the concave and the convex pretend-hypotenuse.
July 16th, 2006 14:52
#5 is tricky…
if you ’squared’ the triangle you would have 13×5 or 65 squares so the triangle (1/2) should have 32.5
Now lets square the red one 3×8=24 so the triangle should have 12
The Dark Green when squared is 2×5=10 or 5 for the triangle
Both versions have the Yellow =7 and the light Green=8
So the top one is 12+5+7+8 =32squares looks like we lost 1/2 someplace from our triangle.
July 16th, 2006 16:32
Triangles? We don’t have any right triangles. We don’t have to show you any steenking right triangles!
All your right triangle are belong to us!
July 16th, 2006 17:24
Haha, I like the “very funny, Peter” on #6
July 16th, 2006 19:26
the answer to the first one is D.N.E
July 16th, 2006 20:31
not so much an optical illusion as ‘fat pencil’ of the figures, hiding the non-linear hypotenuse, as stated above.
a right triangle would be 13×5/2 = 32.5.
the non triangle blocks are 8+7, the two triangles are 8×3/2=12 and 5×2/2 = 5 for total of 32.
the first ‘almost triangle’ is 32 square blocks, the 2nd ‘almost triangle w/ missing block’ is 32 + 1 = 33 square ‘blocks’.
pretty easy to hide an extra ‘1 block’ out of 32 using big black borders on their hypotenuses… a good problem, tho. no trickery.
July 16th, 2006 21:23
#1 I was told while I was a grad student at the Pennsylvania State University (Penn State) in 1979. But the “punch line” of this joke is missing.
The punch line is that answer with ‘5′ on its side is wrong as given the type set used in the original problem, the ‘5′ should be flipped the other way as the infinity symbol in the example was Oo not oO.
Only a mathematician would appreciate that dry humour. Of course, I laughed.
July 16th, 2006 21:38
#1 is funny however it is incorrect..the first problem is not infinity…it does not exist..it’s only infinity from the right side.
July 16th, 2006 22:17
A nit to pick. The top example for the lim X -> 8, that limit does not exist. The left hand limit is different from the right hand limit.
As an answer to Jim (3), this is a problem that is quite old. I saw it when Lewis Carroll proposed it. The simple answer is that it is not a right triangle. It is from a chessboard cut into four pieces, moving from a 8×8 configuration to a 1/2(13×5). The slopes of the triangle pieces are not the same, if you do it algebraicly, the hypoyinuse is not a straight line, geometricly. Not hard, but tricky.
July 16th, 2006 23:20
Thanks I guess joke #5 was on me.
July 17th, 2006 04:36
The thing with the two right angled triangles is:
If you look at the second one closely, you’ll see that the line beneath the red sub-triangle is a little bit bigger then the other lines.
This is the basic idea behind this trick.
Some lines are bigger, some a little smaller. Take a look at the yellow part. In Triangle 1 it is clearly smaller then in Triangle 2.
With some slight changes in the size of the subparts you can get enough additional space for a small hole.
July 17th, 2006 06:23
Hehe this is really funny !1!!!111111
July 17th, 2006 06:46
MAN! How the 5th example can exist???
July 17th, 2006 07:10
The 4 Puzzle Pieces Problem is a classic.
The Illusion is that the Slopes of the Two Triangles are independent. It just looks like a straight line.
Hence, the 33rd Square.
Proof:
The Figure can be bounded by a 13×5 Rectangle.
Complete the Triangles into Rectangles.
There is a 2×8 rectangle, 16 square units, in the Upper Left.
The two “key” figures are a 3×5 rectangle, 15 square units.
15+1 = 16. That’s why there’s a “hole”.
July 17th, 2006 07:23
For number 5: The blue green triangle and the red triangle have different slopes so the top polygon is not a triangle at all and is a different polygon than the one below. Therefore the fact that re-arranging it yields a different area is not a problem.
July 17th, 2006 08:07
Thank you, Alma !
July 17th, 2006 08:14
What I mean is: two of those sets of triangles can indeed be cut from a chessboard pattern 8×8.
July 17th, 2006 10:26
ABC isn’t a triangle! the slope of the red piece is different from that of the bluish one. Simple as that. The others are good though.
July 17th, 2006 12:02
No. 5 is DAMN tricky. Alex is right. it’s not even a triangle. The reason we are tricked is because the slopes of the red and green triangles are similar. (0.375 vs 0.4)
July 17th, 2006 12:13
That was amazing ..
./thanks
ilaiy
July 17th, 2006 12:16
Nope, I’m pretty sure #5 is magic…
Just wondering how many people have to explain it the same way?
July 17th, 2006 14:54
I laughed at #4. That is exactly how i felt doing that kind of sh!t.
July 17th, 2006 17:37
RE: #5
I understand the reasoning behind the 2 diffent slopes however.
I cut out the pattern of the triangle puzzle from a peice of paper and rearranged them back into the same hole i cut to get the orginal peices, and guess what…
There was a square left over…
w… t… f!
July 17th, 2006 19:39
One of the farkers who jumped from;
http://forums.fark.com/cgi/fark/comments.pl?IDLink=2173870
BTW, the characters on your ‘Learn Japanese’ page…. they never existed in our language. Somebody just made up them. Just in case:)
July 18th, 2006 00:57
Simonius, that is EXACTLY why there’s a hole when you rearrange the pieces. The different slopes of the two triangles are still there even if you’ve cut them out (this is assuming that you followed the lines exactly). What you need to do, in fact, is to cut out both large complete “triangles” – one without a hole and one with the holey bit at the bottom – and then try to superimpose them. You’ll notice a bit of discrepancy at the “hypotenuse” (longest side of any triangle, but I’m putting it in quotes because it’s not really a triangle when one side is made of two lines of different angles).
July 18th, 2006 05:10
I know how #4 feel…
July 18th, 2006 12:46
It’s not really a silly solution by a student, but my favorite has always been the one explaining how girls = time and money
July 18th, 2006 12:50
Sorry, how girls = evil, using “girls require time and money”. Doh. Google it.
July 18th, 2006 14:11
Sorry kaddar, how girls = drugs.
July 18th, 2006 20:21
What a bunch of nerds!!! Don’t you geeks have anything better to do than try to figure these out???
For #5: I drew the shapes in CAD exactly as they are shown and rearranged them, and came up with the extra square, the secret is angle A is 20.556 degrees and angle D is 21.801 degrees, therefore, the slopes are different fo the red triangle and the green triangle.
Oops, I guess I’m a geek and nerd too…
Chuck D, don’t believe the hype!!!
July 19th, 2006 18:25
the triangles are not triangles at all. the hypotenuses are not straight lines.
July 20th, 2006 05:47
nice one…but seriously…i guess we all understand #5 by now so there really is no need for anymore explanations…
July 20th, 2006 10:59
I also think the solution to 1/n(sin x) = ? is hilarious and ingenius, seems too clever to be real imo, this isn’t even an equation, there is know way to determine the values of n and x. You would have to know the values of n and x already to get an answer, in which case the oddly creative and intuitive maneuvers to create the word six would be unneccesary. There is a certain elegance to this silly answer that makes me think it was made up. It is a clever manipulation of symbols. If a student did actually do this, and wasn’t trying to be funny, I think this was a brilliant attempt at trying to solve a problem with no comprehension whatsoever. This student should be good at math.
Ever heard of algebra 1&2? You talking pre-algebra mate
July 20th, 2006 12:18
you guys are really ghey… who leaves comments on here anyway…
SUPER LAME
July 20th, 2006 13:06
Seriously, Are you guys retarded? Look @#5 ONE MORE TIME….The gap is there because they are no longer stacked ON TOP of each other.
A five year old would have seen that.
July 20th, 2006 17:57
Joe you are actually retarded. If you look at the area of the colored in on both the bottom one appears to have a smaller area than the top, dumbfuck. Of course, that isnt true we see because of the diagonal discrepancy.
July 20th, 2006 20:51
oh…oh…omg =)) what a copious fancy!!!
July 20th, 2006 23:23
=)) omg ^^ that’s so fun ! I’ll share this link to others ^^
July 21st, 2006 00:29
Very funny ^_^
July 21st, 2006 01:30
hahahahahahaha….. stop stop…. i cant stop laugh
July 21st, 2006 01:32
I dig the division answer for #4. Math makes me want to do the same thing.
July 21st, 2006 03:23
Some interesting thoughts here, guys. Please keep it clean though. I wanted my kids to read this but had to think better of it because of some of the replies. Pity.
July 21st, 2006 04:51
it’s so funny hahahaa
July 21st, 2006 08:45
hahahaha
lmfao
lolz
xD
July 21st, 2006 10:01
wtf…so fucking funny
July 21st, 2006 10:03
i should try number1 onmy maths test soooooooooooo hilarious
July 21st, 2006 10:41
Hehehe, really funny but it’s real
)
(Except #5, it’s a trick)
July 21st, 2006 11:33
Ahahahah!
4th is the best! After working, it’ good for my health! And ….I thinks about the times when I was young. Very funny!!!
July 21st, 2006 16:19
Are you aware that there are people in this world that have a severe medical condition which causes them to be that way? My mother for instance is one of those people. She is a truck driver that has bad knees and a bad back from driving the truck but you probably do not care about that case either. Oh well I am not one of those people I am 6′4″ 245lbs and I exercise every day. I would love to see you say something like to my mother in front of me. Probably never happen though you are probably just an internet tough guy. I doubt very seriously you would say that to someones face. Just my thought.What do you think. Oh I am sorry you probably do not have a brain. I on the other hand will be happy to buy you a plane ticket to come here and see if you have the nerve to say that to someone I know.
July 22nd, 2006 02:51
number three technically should be awarded full points since it does answer the question, it is not the students fault that the teacher is not precise. perhaps what the teacher meant to write was solve for x, but alas he didn’t.
plus what kind of teacher teachs that Lim x->8 of 1/(x-8) equals infinity (it does from the RHS, but from the LHS it is negitive, infinity, thus we must conclude that the limit DNE.
July 22nd, 2006 08:19
#6 is a ingenius one
#2 is a aesthetic one
#4 is a technical one
#5 is a pure one
#1 is a foolish one
#3 is a intuitive one
Jokes is the ones.
July 22nd, 2006 08:57
OMG its so funny………i can’t stop laughing…my stomach cramps…
July 23rd, 2006 01:55
http://www.ophtasurf.com/en/illusions/art7.htm?art7=3…. try this link n u ll get de precise answer to it… thanks..
July 24th, 2006 07:06
What a dark humour!! We all have been students.
Greetings,
Antonio
July 24th, 2006 14:25
im an athletic guy and i absolutely hate fat people, they are a waste of space, especially the ones that keep eating and getting fatter and dont exersize..
i would honestly not care if they all died. **** the fat ****s they make this country look bad… and if you have a problem with this come try to touch me you fat ****s, oh wait you cant even climb a flight of stairs without getting winded…
worthless ****s.”
July 24th, 2006 19:37
Sure is a shame that the pictures aren’t working today.
July 25th, 2006 16:31
Sure is a shame that the pictures aren’t working today either.
July 25th, 2006 22:36
It’s so funny!
July 26th, 2006 13:48
Can anybody explain the #5, do you guys know why is so?
July 26th, 2006 15:32
Hilarious
July 26th, 2006 22:38
post#6 (Gavs) is the one who’s correct about the triangles.
One has a slope of 2/5 and the other a slope of 3/8.
The only shape that’s not a “real” shape is the overall triangle, which really isn’t a triangle at all.
July 27th, 2006 04:40
this is a difficult question
July 27th, 2006 06:09
apo-juice ko metten barok!
July 29th, 2006 06:06
the green triangle can’t have the size 5×2. According to Talet,
when we ruled a line parallel with AC , this line must be 2/5×13=5.2 not 5 length
so when we use 5 length for this line , the unreasonableness will happen !!!!
July 30th, 2006 22:15
WOW! It’s very so fun. Wonderful!
July 31st, 2006 00:46
funny! hehe i wonder why these people thought of answering these problems their way.. walalang!
July 31st, 2006 11:08
hahah
want more!!
July 31st, 2006 20:22
wow……………..they are very intelligent…….hahahha, i like “the way to expand by Peter” so much……….
July 31st, 2006 21:07
hehehe
really funny….
special are # 1 and # 4
August 1st, 2006 00:12
love these jokes.. makes me feel closer to math again, hehehe
but i didnt get #5 right away and didn’t bother to solve for it either… up until i read the comments from other people that yeh both pictures may looks like a triangle but they’re not.. gosh too lazy to compute all those area in them.
#1 & #2 are classic
#3 is what cracks me up. hahahha so DUMB hahaha.. but as someone mentioned above, technically that answer is correct since the teacher did ask “find x”, but hey since we all know that the question doesn’t really meant to “find” x simply by circling it so it is obviously a wrong answer. but just to see someone actually does that.. omg totally cracks me up.
#6 is also funny n dumb
#4 hahahaha hilarious
love these jokes.. is there anymore out there somewhere?
August 1st, 2006 09:07
The gap in the triangle problem is this: Neither figure is actually a triangle. Both are very slightly 4 sided.
In one figure, the hypotenuse bends upward at the joint. In the other, it bends downward (inward) at the joint. The combined difference is enough to make up the missing square.
August 1st, 2006 13:33
OK, there have been lots of explanations to #5 and they are ALL WRONG.
The correct answer comes when you look at the two red triangles. The red triancle in ABC is 8 units wide along the bottom. The red triangle in DEF is 7 units wide along the bottom.
The pieces are not the same in DEF as ABC, so there is a “hole”.
Ed
August 2nd, 2006 03:58
Ed Cayce;
I think you should take a second look at #5. The repeated explanation that the red and green triangles have different slopes and therefore the combined shape is not a triangle at all is correct. If you look carefully, you will see that your explanation (discrepancy in the size of the red triangle) is incorrect-both red triangles have a base of 8 squares and a height of 3 squares. Incidentally, that would make more than a single unit square difference
(3*8)/2=12
(3*7)/2=10.5
there would be a 1.5 square difference between the two triangles if you were correct.Of course, the two triangles would still not have the same slope, so…
August 2nd, 2006 05:00
Ed,
Look again. Cut them out…they are the same. The explanations about the angles are correct.
mark
August 2nd, 2006 11:04
Lols! But the triangle…I still keep thinking how impossible it is!
August 3rd, 2006 10:26
LOL!!!
(a+b)^n
( a + b ) ^ n
( a + b ) ^ n
…
August 3rd, 2006 12:09
Ed, you’re very special man & I’m sure your momma reminds you of this fact every night after she’s tucked you in, fed you and helped you change. In your very first sentence you managed to convince me that the true solution to #5 is way beyond your intellectual capacity (& I just read the rest of your comment (#78) to humour myself, and I guarantee you, I was not disappointed).
I just ask one favour of you Mr Cayce, that you please change your name from Ed to something else because Ed is actually short for Editor, and in your sorry case you bring shame and disrepute to that entire profession. I was thinking something like “Nut”, that way if you say your name and surname quickly, it sounds like nutcase.
Have a great day nutcase (& try that counting to 8 thing again when you’re not too tired), cheers.
Force
August 4th, 2006 04:01
A bit surprised I admit, but glad nonetheless that my previous post (#83) was accepted, – it just serves as further confirmation that there’s now some “passive” agreement to the fact that from here on Ed (post #78), your name is fact Nutcase.
Okay Nutcase, own up – you submitted Funny Math picture number 3, didn’t you? X always marks the spot hey, nice one.
Force
August 6th, 2006 10:09
Very funny…
http://www.paketim.com
August 7th, 2006 11:43
Perhaps #5 involves non-Euclidean geometry?
August 7th, 2006 19:23
I think #5=light green piece+orange piece=
NOT THAT KIND OF RECTANGLE, GENIUSES
here you are, solving this with advanced math and here I am, a 10 YEAR OLD, giving a much simpler answer.
10 YEARS OLD
http://home.comcast.net/~drew.notarnicola
drew.notarnicola@comcast.net
August 8th, 2006 14:17
wow….that’s about all i can say. and those of you with bad attitudes and naughty words…shame on you~
the math is really funny, but you people with your detailed explanations of things makes the humor of the whole joke dissapate. it would be best if you would just appreciate the joke as is instead of trying to pychoanalyze every minute detail.
again i say to you…wow.
lovely
August 8th, 2006 17:03
#5:
tan (red triangle) is not equal to tan (dark green triangle)
another way to tell:
complete triangle is not a triangle. it is polygon..
that easy..
rest are funny..
August 10th, 2006 09:27
only a bunch of losers will turn a couple of jokes into a serious academic discussion.
August 12th, 2006 10:18
Actually although in this case problem #5 is a fallacy indeed, because the slopes of the hypotenuse of both triangles differ enough that the second triangle has the extra square figure; but this problem could be made possible with 2 equal triangles (with equal slopes) by re-arrangement using something in Math called Fibonacci number (supposedly the best way to arrange something). The person who created this image was either lazy or didn’t know of Fibonacci numbers so created a similar but illusive image of a possible problem.
August 12th, 2006 10:22
…If you examine this image ( http://www.mcs.surrey.ac.uk/Personal/R.Knott/Fibonacci/jigsaw3.gif ), you’ll notice that all the slopes of both triangles are equal; therefor both triangles are equal, but the extra square still exists in the second triangle. This is because the pieces were all re-arranged using the Fibonacci number sequence.
Read On: http://www.mcs.surrey.ac.uk/Personal/R.Knott/Fibonacci/
August 14th, 2006 04:59
Number 5.
This is a visual trick.
I remember printing both triangles on paper and cutting them out very precisely.
One of them was not really a triangle. Its longest line was not quite straight. It was ever so slightly curved.
August 16th, 2006 05:02
Very cool
August 16th, 2006 05:36
#5 was starting to piss me off until it was explained that it was an optical illusion. It doesn’t belong here.
August 18th, 2006 06:45
Even I..Einstoon..found this amusing
August 20th, 2006 14:11
Ugh… after reading a couple of those explainations for #5… i should have just read the jokes, cause my brain hurts…
, But seriously, I’ve been very tempted to put #4 as the answer to some of my math homework… Also, 1475551, did you even look at the rest of the responses before you put yours in? And lastly, everyone who likes this should look up that girls=evil thing. It’s freakin hillarious. And true.
August 25th, 2006 20:11
ITS Curved–OMG –my brain was hurting with all those clever explainations –its an optical illusion. at last i can rest in peace.
August 28th, 2006 09:29
Wow, awesome.Indeed it is vey funny. Hahah=> Especially the expanding of the equation.
August 28th, 2006 12:19
#6 is the best!
- Steven Burda -
e-mail: steven.burda.mba @gmail.com
http://www.linkedin.com/in/burda
August 30th, 2006 21:17
DrSeltsam SUX !
August 30th, 2006 21:18
DrSeltsam SUX but this is funny
August 31st, 2006 07:10
Example 5:
have a look at :
http://www.willaan.nl/indexPuzzles.htm
September 1st, 2006 12:40
Some were quite funny, but the triangle makes complete sense. The orange shape had an overhang, and it din’t appear out of nowhere. If you look at it and think about it it makes sense
September 8th, 2006 18:38
hahaha! #5 is such a cheater! look closely and you will see the discrepancies on the thickness of the lines (grids) and also on the size of each grid. anyways, Q4 almost got my stomachs ripped due to excessive laughing. too bad, i haven’t done that when i was still in school!
hahaha!
September 9th, 2006 09:55
very amusing i love it!
September 12th, 2006 19:10
Ahwwwwwe. I laughed so hard I cried. hehe. Pretty cool. =]
September 19th, 2006 06:40
omg!! maths can be this “fun”!! hilarious!!
September 22nd, 2006 09:23
lolerskates
September 26th, 2006 11:11
Solution for #5
It is not as hard as many people think!!!
September 26th, 2006 11:25
Solution for #5. It is not as hard as many people think;
Solution for this problem : Solution from Thanh-an Nguyen.
In the top triangle ABC . Suppose AC = 13 units . BC = 5 units
The red part is the right triangle with the base of 8 units and the height of 3 units.
Then the dark green right triangle on the top of the triangle ABC would have the horizontal length of 5 units and the vertical height of x units.
I prove to you that x
September 26th, 2006 11:27
I prove to you that x
September 26th, 2006 11:28
x
September 26th, 2006 11:29
x IS LESS THAN 2 units. ( Because if x IS LESS THAN 2 units then the vertical length of the light green shape would be less than 2 units: So the color in of the light green shape and the remain shape in the triangle DEF would be wrong. )
Prove: Tan (BAC) = 5/13
So x = 5Tan (BAC)
= 5(5/13)
= 25/13
So x is less than 2.
Problem solved.
If you disagree with me email to ~ anguyentong@hotmail.com~
October 6th, 2006 12:46
I think all of them is funny….
October 27th, 2006 09:25
#4 was new to me. I feel his pain. The original version of #5: Cut a 8×8 checkerboard (use graph paper) into a 3×3 square, a 5×5 square, and two 3×5 rectangles. Cut the pieces into triangles along each diagonal. Rearrange the pieces into a 13 x 5 rectangle. The original area of 64 seems to become 65! The very slender gap along the diagonal (yes, the slopes are different- the diagonal is not really a straight line) is the missing square unit.
November 1st, 2006 12:12
LOL, hilarious!
November 8th, 2006 01:29
Its funny. No.5 is not that hard, I wonder why most responses complain alot about it. ABCs are not triangles as many may take it.It has not even been said that they are triangles(they are very careful indeed).Why do most of us believe that?
November 9th, 2006 06:57
thank you for making this website…you just helped me with my project…no. 3 is funny
November 9th, 2006 08:17
I love your website beacuse it helps me alot in math beacuse i didn’t understand mathwell
November 21st, 2006 22:32
ha ha! This is funny!!!!!!!! I love all of them, but #5 isn’t really funny
November 29th, 2006 05:56
very funny!!!!!!!
Ilove it very much
Some more?
November 29th, 2006 05:57
thanks
please get some more
December 1st, 2006 17:06
lol. #3 was especially funny, since that’s something I would have done 3 months ago.
December 22nd, 2006 00:04
These are utterly brilliant. They bring out the inner math nerd in me. Good job!
December 24th, 2006 08:31
#3 is funny because it involves a stupid
person solving a (according to him) stupid
question, coming out with a really stupid answer.
stupid + stupid = really stupid
January 4th, 2007 23:23
Well, number six was funnier because of the creative direction. There’s a Peter Nguyen facebook group, if anyone wants to join, by the way.
January 25th, 2007 11:36
In my opinion, the first, the second and the third are the best ones, ah, and also the last one.
Really funny!!
January 25th, 2007 14:21
#1 doesn’t make sense but it’s funny!!! limit to 8 is impossible and is not to infinity
January 27th, 2007 16:31
what the hell r u all on about. no. 5 isnt an optical illusion or shit. look at the two odd shapes in the thing. they fit perfectly intogether on the first 1 but bcos of the way they are positioned it leaves a hole
January 28th, 2007 13:57
I do NOT understand the triangle one!
January 28th, 2007 14:01
Wait, are some of these pictures like dumb blond jokes? If they are, that is cruel, why cant they be brunett jokes? Most of my friends are brunetts and they are like some of the blondes in the better jokes!
January 28th, 2007 14:04
duh, # 2 is a definit blonde joke, but i do agree with you on the blonde jokes, they are a little mean, I am in all AP classes, and i am a blonde?
January 28th, 2007 14:06
i love holden
January 30th, 2007 13:22
HEYY MY LOVES. WUT iS UP WiTH YOU ALL ? NUTHiN HERE JUSS CHiLLiN YOU KNO !! BUT ANYWAYS i THiNK THAT THiS STUFF iS SUM HARD STUFF! l0l !! BUT i RELE HAVENT TRY’D iT YETT THO. THAT MiGHT BE Y! BUT ANYWAYS ANYBDY WANNA HELP ME WiTH iT i WiLL LOVE YOU FOREVER !! HEHE !!
SiNGLE !! AND CRUSHiN !!
February 3rd, 2007 08:19
my fren got asked me tis Q’s, i knew them already… veli funny.. bt i oso got a freak Q, n0 body can explain it 2 me… ca u?
x + y = 0 2x + 2y = 0
1(x + y) = 0 2(x + y) = 0
1(x + y) = 2(x + y)
1 = 2 ???
February 5th, 2007 05:47
Very funny triangle ain’t no good though lol
February 5th, 2007 05:48
Very funny the triangle aint no good though!! lol
February 5th, 2007 05:48
FUNNY lol Triangle aint no good
February 5th, 2007 05:49
Josh m8 you cool kid pretty Nifty FUNNY!!
February 5th, 2007 05:50
lmao wtf u silly cunts
February 6th, 2007 09:06
*yawns so loudly at 5:30 in the morning, falls over in his chair and goes to sleep…….
*Snores very loudly….
*Snores very dreamily….
*Suddenly wakes up as he dreamt of the missing puzzle answer
*types “ok lads, to make a triangle of 4 pieces and shift them without having a hole, u would need 4 right triangles to make up that original triangle, if u use rectangles as such shown, u will always have a hole in the original right triangle”
*sighs…types” time to go to school after visitin this ridiculous website for the first time… think i’ll check for replies for no reason up until March”
(i HATE highschool =( )
February 16th, 2007 20:28
This shittt is jokes. yea, the best one is with peter, when he expandsd, then says ect.. WTF is wrong wit u ppl? u R3tarded nerds have nothing better to do than look for the answers and try to get the triangle one. get a life mudda fukkas. sh1tt. its supposed to be a joke, dont take it so seriously
February 19th, 2007 20:17
Very funny math jokes.
As for the triangle problem, give it up people. Who cares if you have the right answer or not? Not going to help you in life.
As for the answer, yes the slopes of both triangles are different, meaning neither overall shape is a triangle, but in fact a strange 4-sided object.
February 21st, 2007 04:54
Can’t help laughing. Great site!
February 25th, 2007 12:24
The funniest is the first one. Where the teacher gets the equation wrong. LOL. 1/(inf-5) does not equal inf…..
LOL
March 8th, 2007 14:52
hmmm
the thing with the 2 triangles & the puzzle:
the only problem is that the hypotnuse of the first triangle is NOT a straight line, therefore the first drawing is NOT a triangle, and when we reconstitute the pieces into the second drawing we get a real triangle. the 2 drawings are not the same.
pfff.
March 9th, 2007 18:45
Very funny!!
Where can I find more questions and “wise” answers??? Any ideas?
March 23rd, 2007 13:17
OMG #6 IS HILARIOUS!!!!!!!!!!!!!!! THEY ARE ALL SO FUNNY, I ALSO LOVED #4, ALTHOUGH IT’S KIND OF SAD! HAHAHAHA
March 25th, 2007 16:45
Oh gosh….These people need to go back to High school..i mean..look at #3!!
March 28th, 2007 17:24
#5 is not funny at all – just a simple riddle, it shouldn’t even be here!
March 29th, 2007 15:41
just be honest Niko and admit that you are a pedantic nerd who is severely humour-challenged.
March 31st, 2007 22:41
erm… still can’t understand tat triangle lah!!! even though some ppl hv explain tat bt i still can’t understand… (T_T)
April 1st, 2007 18:55
I can’t believe no one mentioned that the elephant one’s question ask if the object still moves after it comes to rest. That’s kinda funny.
April 4th, 2007 08:11
it was very funny
April 7th, 2007 22:49
Very funny. Here’s another real answer that a student handed in on an exam.
Question: The water of the earth’s oceans stores lots of heat. An engineer designed an ocean liner that would extract heat from the ocean’s waters at Th=10 degrees C (283 K) and reject heat to the atmosphere at Ti=20 degrees C (293 K). He thought he had a good idea, but his boss fired him. Explain.
Student’s answer: Because he slept with his boss’ wife.
April 13th, 2007 09:01
The answer to 7 is a 1.71m and b 5m. You can get a due to conservation of energy. GPE=EPE GPE=mgh EPE=.5kx^2 GPE=147J
127=.5(100)x^2 x=1.71. B is also conservation of energy. Since the ramp is frictionless the no energy is lost due to nonconservative forces and no energy is added to the system, therefore the block will return at 5m.
April 15th, 2007 10:04
your in a boat. you throw a rope ladder over the side. the ladder has 12 peggs, each 1 foot apart.if 9 peggs are under water and the water is rising a 1 foot per hour, how long will it take for the remaining peggs to become submersed?
April 21st, 2007 00:02
No. 3 is very funny!!! I can’t understand why there is an integration in the process of solving x!!!
April 21st, 2007 00:21
I need math because i’m an engineering student, and i’m looking for some puzzles just for fun, well, I saw this website and I COULDN’T BELIEVE the questions are hard to answer!!! I laughed so much…Comments:
#1: Limits are used in inverting numbers
#2: Our professor taught us that joke
#3: the person who asks to find x is blind
#4: try and try until you die!
#5: ? (the figure was changed)
#6: He make expansion for a and b!!!
#7: No comment…
April 21st, 2007 00:39
Answer this:
(x-a)(x-b)(x-c)(x-d)…=?
April 26th, 2007 05:44
this is stupid. only smart people come here!
April 26th, 2007 16:01
My calculus class made up #1 for our teacher’s
birthday in 1969. We also made her laugh with:
Integral( d cabin / cabin ) = log cabin
April 26th, 2007 20:03
#5, is the begining of the explantion of how the Tardis exists!
TL
May 9th, 2007 06:07
The triangle one? I dont think it is complicated! The yellow shape is in a different place than it is in the 1st picture DUH!!!!! Its not that technical!
May 12th, 2007 00:29
It amazes me that the previous commenter did not notice why #5 calls for an more technical explaination. Moving pieces around does not change their area. And yet, triangles ABC and DEF APPEAR to cover the same area, (except for the missing chunk which definately needs an explaination).
Of course, the real explaination has already been presented by many people, which lies in the fact that triangle DEF is hiding the extra area in its fatness. Line DE is not really straight and neither is line AB. Triangle ABC is ’skinny’. It’s an illusion. (Read the previous comments about the slope.)
May 13th, 2007 01:32
I wrote number 7 ten years ago in my high school pre-calculus class. I stopped in my tracks when I saw it on an office wall at work. I thought I threw that thing away.
May 22nd, 2007 16:47
this site is weird.
i hate maths so there jelly bean heads
May 24th, 2007 02:22
Funny… I went ahead and graphed #5 to clarify the illusion.
http://www.inversethought.com/Eriks/math_problem.jpg
Neither of the objects is a triangle. The difference between the blue line and the lines of the pieces is quite evident in the picture when using thin lines.
As for all the other ones, funny. = )…
May 25th, 2007 23:41
I once gave a test that had some multiple choice and true/false questions. One of the students asked me about the true/false: “Do you give partial credit”?
May 29th, 2007 01:19
Number 5 is confusing, until examining it for a while then you realise… well it’s confusing anyway
the rest are really funny, i’ll consider writing some of these or something similiar just to see my maths teachers reaction.
June 30th, 2007 15:14
ah what can i say………….
my god………..
trust me, i rote all this after 7 minutes of non stop laughing.
all of them are the BEST
pls do tell me more of this kind of sites
July 6th, 2007 16:33
I’m dying ha haaa haaaaaaaa…..
July 13th, 2007 08:52
I found this site realy awesome, you guys can make a complex engineering mathematics to a first grade funny math!
July 19th, 2007 03:14
The hypoteneuse is perfectly straight, truth to tell. Put the question on paper. Cut out the triangles, and place them together so they make a rectangle. There. Already disproved the curvature explanation.
http://forums.philosophyforums.com/threads/to-a-puzzle-from-a-thread-i-cant-resurrect-25871.html
Cadrache wrote:
If you use the c^2 = a^2 + b^2, You always have multiple answers to the variables a, and b. All they must require for the question is that c^2 is always the same value.
We do not change the colors that represent the hypotenuse in both triangles. This means that the value c^2 is a sum of two values; which is the hypotenuse of the green triangle, and that of the red triangle. Since we do not change the shape of any of these, you get hypotenuses for both triangles that are static.
c^2 = (g^2+r^2) = (ga^2*gb^2) + (ra^2+rb^2)
That means that the big triangle’s a^2 = ga^2 + ra^2
and the b^2 = gb^2 + rb^2.
This denotes that gb and rb are seperate ‘numbers’ when you find them.
What this means is that you now can ‘find’ the value for the area missing from each triangle, that is not covered by the green and red triangle.
b = vertical side
a = horizontal side
So gb = 2
rb = 3
ga = 5
ra = 8
A = 13
B = 5
Triangle 1 area not covered by green/red section.
A1 = 5. uncovered by red area = A – green value = 5-2 = 3
B1 = 13 uncovered green area B – red value = 13-8 = 5
Area in triangle 1 not covered by green and red triangle:
3 x 5 = 15
Triangle 2 area not covered by red/green section.
A2 = 5 uncovered by green area = A – red value = 5-3 = 2
B2 = 13 uncovered by red area = B – green value = 13-5 = 8
Area in triangle 2 not covered by green and red triangles:
2×8 = 16
difference in area between triangle 1 and triangle 2
16-15 = 1 square block
Elephants rule, by the way =D
July 27th, 2007 05:36
#5 something else to think of
area of top triangle = (13 x 5)/2 + 32.5
area of red triangle = (8 x 3)/2 = 12
area or blue triangle = (5 x 2)/2 = 5
area of yellow polygon = 7
arae of green polygon = 8
12 + 5 + 7 + 8 + 32
were has the 0.5 gone
July 27th, 2007 05:38
#5
typig error on previous submision before anyone tries to corect me
something else to think of
area of top triangle = (13 x 5)/2 = 32.5
area of red triangle = (8 x 3)/2 = 12
area or blue triangle = (5 x 2)/2 = 5
area of yellow polygon = 7
arae of green polygon = 8
12 + 5 + 7 + 8 = 32
were has the 0.5 gone
August 2nd, 2007 07:43
Everything’s hilarious.. the triangles especially. But if we will try a closer look, green triangle has a slope of 2/5 while the red one has a slope of 3/7. This just mean that they are not similar triangles so lines AB and DE are not straight lines. This explains the difference in area.
August 2nd, 2007 08:04
slope of red is 3/8.. just a correction =)
August 15th, 2007 18:20
hihihihi……….
the 4th is the best…….
very good solution… lol
August 19th, 2007 05:14
Ok the triangle problem…
first off, look at the colors. the teal and red triangles switch places, which makes room for the orange and green pieces to shift… almost like if you were playing Tetris and you messed up.
August 31st, 2007 08:13
tom@to, you wrote in comment 136:
>my fren got asked me tis Q’s, i knew them >already… veli funny.. bt i oso got a freak Q, >n0 body can explain it 2 me… ca u?
>
>x + y = 0 2x + 2y = 0
>1(x + y) = 0 2(x + y) = 0
>
>1(x + y) = 2(x + y)
>1 = 2 ???
the answer is that in that last step you divided by zero, which is impossible. 1 does not equal 2 because you divided both sides of the equation by (x+y), which, according to your first equation, is equal to zero.
Hope that helps.
September 6th, 2007 11:00
wow…this is really funny especially question 3″find X” and also question 6 the expansion
September 8th, 2007 12:21
to whomever
thanx for finding my homework book
please drop it at locker 10810 at trash school
September 29th, 2007 16:35
Okay, so the triangles one is fairly easy when you realise that the blue/green one and the red one aren’t siimilar. The ratio of the two sides are 5:2 and 8:3 (instead of 7.5:3 for it to be similar)
As for the ball/spring elephant puzzle:
if the slope is frictionless then, instead of trying to work out velocities and so on to find x, you can just use the energies of the stationary object at the beginning and the end.
The energy of the ball at the beginning of the experiment is
PE = Height.Mass.Grav_accel = 5×3x9.81J = 147.15J
so the energy stored in the spring when it becomes stationary must be the same.
so…
PE = (k.x^2 ) /2
therefore
x = sqrt ( 2.PE / k) = sqrt (2 x 147.15 / 100) = 1.72m
September 30th, 2007 17:10
#5 DE isnt staight as we see.the composer just bluff us by drawing it so straight
So i like the 4th best.Poor the man.
October 2nd, 2007 07:25
so funny!!!!
muhahahahhahahaa
i wanna see more looooool
October 4th, 2007 19:52
lol, you must do some more.
October 7th, 2007 03:16
lolz funny….. but donno why ppl arnd cant answer the two triangles …. n the ones who tried to answer it was amazignly stupid….
they have to see tht the red and gree triangles just change the place…. how come can it change the slope???
in the first triangle the slope is equal to slope of red triangle + the slope of green triangle which is same as that in triangle 2…. so what made it changed??? how come any one can say that if 2+1=3 then 1+2 does not equals 3….
this example is actually true for the fact that for a similar area of any region the perimeter of the area need not to be the same. i.e.
to make it simple lets consider a rectangle with sides as 2 and 4
this makes
the area as 2×4=8 and perimeter as 2+2+4+4=12
now what do u say abt the triangle with sides as 1 and 8…
area = 1×8=8 which is same as previous but
perimeter = 1+1+8+8=18
the empty square is actually the contribution of the red triangle in figure 1 to the total perimeter of fig1. which is reduced in fig2.
we can see that the contribution of the red triangle in fig 1 is its base and hypotenuse where is in fig2 it is the hypotenuse and the perpendicular.
similarly the brown piece is contributing 1 unit in fig1 to the total perimeter. However to overcome the deficiency by moving the red triangle cud have been covered by 3 brown units. whish is observed in the fig2.
October 8th, 2007 23:51
I think I’ve figured out the triangle problem. By figuring the area of each individual shape, and then calculating the greater triangle, you will find that there is a discrepancy. Upon further examination, I found that one has a slightly convex hypotenuse, and the other has a slightly concave hypotenuse. This slight discrepancy (of 1/2 unit per figure) accounts for the full unit difference betweent the two. Try constructing your own triangles on your own sheet of graph paper. You will find it impossible to include the shapes as shown in the problem. Only by skewing the hypotenuse can you ‘force’ the shape. Very clever and hard to detect.
October 11th, 2007 10:17
Three things:
1- how the hell would you solve the second one?
you have two unknowns in one equation and its already simplified…
2- about the intregal (d cabin /cabin) wouldn’t it be “natural log cabin”?
3- number seven is not a pre-calc problem
October 17th, 2007 02:15
The one about the elephant is pure genius- as a big physics guy, i cannot tell you how many times I’ve wanted to put something like that as an answer. The one with the two triangles is just stupid, there really is no point in having that on a joke page.
我真喜欢！ 请你们给我们更的。
谢谢，
喝醉的袋鼠。
October 18th, 2007 08:15
very funny
October 23rd, 2007 01:04
Here’s one for you from my online homework:
http://i203.photobucket.com/albums/aa31/crimsoncatpitas/arguement.png?t=1193090594
November 4th, 2007 20:53
the missing chunk in the triangle problem can be easily explained because the pieces are stacked differently. NOtice first that these triangles have been drawn on grid paper. They are both clearly the same size in both height and length and there is no “optical illusion”. You will notice the “arm” on the yellow piece is 3 grid squares long which fits over the top of the 3 grid square wide section of the green piece. HOwever, in the lower triangle the yellow pieces “arm” (3 squares long” is stacked over the section of the green piece that is only 2 grid squares long leaving a gap of 1 grid square. I dont know how funny that really is but its not impossible.
November 4th, 2007 20:53
the missing chunk in the triangle problem can be easily explained because the pieces are stacked differently. NOtice first that these triangles have been drawn on grid paper. They are both clearly the same size in both height and length and there is no “optical illusion”. You will notice the “arm” on the yellow piece is 3 grid squares long which fits over the top of the 3 grid square wide section of the green piece. HOwever, in the lower triangle the yellow pieces “arm” (3 squares long” is stacked over the section of the green piece that is only 2 grid squares long leaving a gap of 1 grid square. I dont know how funny that really is but its not impossible. Yeah>
December 11th, 2007 08:52
Hello, great maths jokes.
Wld like to know the response of No.194, the answer for the polar form are typed using what software?
Thank you. Cheers. : ) Woon
December 14th, 2007 17:58
A family of 25 cattle rustling brothers meets once a year to divide up their ill-gotten gains. Each brother brings in all the cattle he has stolen that year and the brothers then evenly divide up the total herd between themselves giving any remaining cattle to the cook at the end of the round-up. On the day they arrive, the cattle are divvied up and there are three cows left over. That night an argument between the brothers turns nasty and seven of them are killed. The following morning they redistribute the cattle, this time having seven cows left to give to the cook at the end of the round-up. That night the roof of the bunkhouse collapses killing another seven brothers. The following morning they re-divided up the cattle between themselves, this time leaving ten cows left over for the cook at the end of the round-up. On the third night the cook poisons the remaining brothers taking all the cattle for herself.
How many head of cattle did the cook get? Find the least number.
ForwardSourceID:NT00007876
December 15th, 2007 12:28
ha ha ha ha ha ha ha… can’t breath.. tooo funny….
December 21st, 2007 13:14
Q:The sides of a triangle are 6,8,10.What is the area of triangle formed by incentre, circumcentre & centriod?
December 21st, 2007 13:15
CHALLENGE!!!
January 14th, 2008 03:24
“Robin (190)
October 8th, 2007 23:51 190I think I’ve figured out the triangle problem. By figuring the area of each individual shape, and then calculating the greater triangle, you will find that there is a discrepancy. Upon further examination, I found that one has a slightly convex hypotenuse, and the other has a slightly concave hypotenuse. This slight discrepancy (of 1/2 unit per figure) accounts for the full unit difference betweent the two. Try constructing your own triangles on your own sheet of graph paper. You will find it impossible to include the shapes as shown in the problem. Only by skewing the hypotenuse can you ‘force’ the shape. Very clever and hard to detect.”
Thank you Robin! Finally there’s someone who can explain this right!!! Yeah I got the same answer too (I answered this before I read yours so don’t say that I copied yours… I was going to post my answer up but then I found your answer…)
And to usman (189)… ahh you said people were stupid but then oh hey what you said didn’t really answer the question being asked!!!
February 6th, 2008 23:47
5.
The red triangle in ABC must be proportioned to the ABC triangle.
Being AC=13 and BC=5, the base and the height of the red triangle cannot be 8 and 3: the equation
5:13=3:8
is not possible.
this is because we have:
5:13=x:8
x=3.0769
or, as well
13:5=x:3
x=7.8
The area that seems to miss in triangle DEF is therefore an illusion:
the same area is in very little parts of the various pattern and we cannot see them.
February 21st, 2008 04:33
In #5, the space occurs because the red and green triangles are not interchangeable.
Imagining the yellow and green trapezoids shoved together the same way they are in the example above it would show what an untidy mess would result. If you’d bother to count all the colored squares and their portions, (and who would?), you’ll see they occupy the same amount of area.
February 27th, 2008 14:13
Its title should be “How Maths can become really interesting?”
March 16th, 2008 03:33
Very Funny. Ican’t stop laughing!!!
March 24th, 2008 15:01
this looks so funny…
i 2 like 2 try like this in my examzzzzzzzzzzz
March 31st, 2008 03:55
Noobs, number5 is so easy. Look at the slopes of the hypotenuses (rise/run). That is the answer!
April 3rd, 2008 06:18
Boogala!!!Boogala!!!
May 14th, 2008 03:29
oh man the was so easy no 5 and no 2 7 and 6 but that was funy also i did enjoy it and mostl i like ti its interresting don’t you think so i do bye babes!!
May 14th, 2008 03:29
oh man the was so easy no 5 and no 2 7 and 6 but that was funy also i did enjoy it and mostl i like ti its interresting don’t you think so i do bye babes!!
May 24th, 2008 21:42
thalle chirichu mannu kappippoyi………………………………sajeed n
June 11th, 2008 21:34
LOL! This is real funny. Did they ever graduate?
July 3rd, 2008 21:25
wow this is really great. I would do this but my grades are bad enough as it is
July 24th, 2008 03:53
love it
August 12th, 2008 18:10
Haha..these are really very funny..lol
Thanks for sharing
August 21st, 2008 01:17
interesting……….
September 17th, 2008 19:35
Thanks for this i want more! special is #4 and #5 check also http://alotofit.com it’s also great with full of fun!
October 5th, 2008 01:09
haha. those are pretty funny
November 11th, 2008 14:34
Be careful with these triangles:
Total it has 13 width and 5 height.
13/5=2.6
The red one is 8/3 that’s 2+2/3=2.6666666666…
and th green triangle has 5/2=2.5
So the triangles won’t really fill the big triangle…
November 24th, 2008 04:24
the triangle’s slope isn’t the same and both of them is not straight
December 4th, 2008 02:08
damn this is shit
December 9th, 2008 16:38
Great!
on no.3 the question should be, solve x? so goes for the triangle if you solve it graphically you won’t have the same answer.. the weird part is, we can’t trust our eyes. and neither math, after all these came from our all imagination, trying to find all the answers logically when in fact nothing is…
December 17th, 2008 08:24
thank you baby sana sseviyorum
December 17th, 2008 14:50
I majored at physics and took a lot of math classes.
To be honest they are the smartest answers I’ve ever seen.
Im not joking or being sarcastic.
I think those guys are much more smarter than those who solved the questions.
December 19th, 2008 22:09
I’ll call this creative rather than mistakes or foolishness.
You know, everyone is not capable of doing this, right?
Regards,
Jay R Modi, MBA
December 20th, 2008 02:13
IT SUCKS BADLY VERY BADLY HOEVER MADE IT IS STUPIDER THAN HELL!!!!!!!!!!!!
January 5th, 2009 05:20
They r so so so so funny!!!!!!!!!!
After I read them I couldnt stop laughing 4 an hr!!!!
LOL~~~ ^^
January 5th, 2009 06:30
the triangle’s slope isn’t the same and both of them is not straight
January 6th, 2009 10:41
how funny was that girl inspite of explaining her so she dint solve it correctly………its all cool please add some more…
January 8th, 2009 17:41
pornolar seyrettim çok güzel
January 9th, 2009 22:52
To the person who asked why the triangle thing didn’t work, it’s not actually a big triangle…it just looks like one. The slope of the hypotenuse of the red triangle is 3/8 and the slope of the greenish one is 2/5. The top shape is a concave quadrilateral and the bottom one is a convex quadrilateral, which gives the bottom one room for the empty square.
February 1st, 2009 11:48
HAHAHHAHAHAHHAHHHAH…..HAHAHHAHAHAHHAHA
It rocks im still laughing…
HAHAHAHHA
they are WOW…………Very Dam nFunny…
RoCkon U made my Day..
February 17th, 2009 13:29
ha ha ha ha ha ha ha ha
February 27th, 2009 02:12
Fantastic
March 28th, 2009 15:19
good fun…..
why not laugh….!!!!!!!!!!
March 30th, 2009 14:58
US AMERICAN EDUCATION AT WORK !!
April 14th, 2009 17:59
looooooooooooooooooooooooool
August 25th, 2009 15:42
very ffunnyy man. thanks
October 3rd, 2009 10:41
this is a wonderful joke among all the subject thax