Visualize
Math brain teasers require computations to solve.
Visualize a cube. You know it has 6 faces, 8 corners, and 12 edges. Now, imagine a knife slicing away each corner with a straight plane cut.
How many total edges are there now?
HintA straight plane cut is a straight, smooth diagonal cut.
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Answer
There are now 36 edges.
(The original 12 edges, plus 3 more for each of the 8 corners, making 36.)
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Comments
shabz4lyf
Oct 14, 2005
 Visualise indeed...wonderful! 
AZTTT
Oct 14, 2005
 got me! I forgot the original ones.
Nicely done. 
trumpetsgirl
Oct 14, 2005
 a exelltent math problom. i really liked this one. right up my alley keep em coming 
Therulerofthem
Oct 14, 2005
 This may sound dumb, but congrats man, this was the 9000th teaser accepted. 
redraptor50
Oct 14, 2005
 Great one again fishmed, I just thought of cutting a square cheese cake Keep them coming 
brainster
Oct 15, 2005
 hey cool, i actually worked it out ! good one ! 
stil
Jan 04, 2007
 Unless the slicing goes as far as the middle of the sides. Then the old 12 edges are replaced by the 24 new ones. 
javaguru
Jan 05, 2009
 I was thinking the same thing as Stil. It was pretty obvious what answer you were looking for, but the wording of the teaser left a number of other possibilites open. 
SRB_1807
Aug 18, 2011
 good one .... 
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