Here's one that I didn't get right the first time, and still kinda can't visualize. (And I thought I was good at 3D stuff.)
The Pup Tent Problem | Futility Closet Quote:
In 1980 the Educational Testing Service offered this question on an aptitude test:
In pyramids ABCD and EFGHI shown above, all faces except base FGHI are equilateral triangles of equal size. If face ABC were placed on face EFG so that the vertices of the triangles coincide, how many exposed faces would the resulting solid have?
(A) Five (B) Six (C) Seven (D) Eight (E) Nine
Which is correct? |