Ralph Shumaker wrote:
Apparently, the two pyramids in question are *not* the same, except that they are both completely equilateral. One has a square base. The other has a triangle base. The answer seems like it would be 7 since the one has 5 sides, the other has 4 sides, and one side of each is completely covered up. But 7 is *not* the correct answer. Can you guess what it is? (BTW, the official SAT answer apparrently *was* "7", but was challenged, and found to be wrong.)
The trick has to do with the dihedral angles: Tetrahedron = 70.53 Octahedron = 109.47 (if you split it in half it's the second pyramid) 109.47+70.53 = 180.00 -a -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-lpsg
