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Boring, boring... (Posted on 2005-03-06) Difficulty: 4 of 5
You have a 3x3x3 cube. You bore a circular hole, of diameter 1, from the center of the top face to the center of the bottom face. You bore a similar hole from the left face center to the right face center, and another hole from front center to back center. How much material was removed?

See The Solution Submitted by Federico Kereki    
Rating: 4.4286 (7 votes)

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re(3): picture of the center | Comment 7 of 13 |
(In reply to re(2): picture of the center by Charlie)

Maybe a better prespective can be gotten from this 3-D picture.  You have to cross your eyes, to look at the left image with your right eye and the right image with your left eye.  It might help to bring a finger or pencil halfway to the screen and focus on that, then observe the cube in 3-D in the background, taking the finger or pencil away.
  Posted by Charlie on 2005-03-07 14:15:51

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