... diameter is 4 2 d . The area of the first circle is 4 2 1d. The area of the second circle is 4 2 2d. We know that 4 2 1d= 2 x 4 2 2d 22 2 1 2 2 2 1dddd ... AC 2 > AB 2 + BC 2 The best answer is A. Draw a sketch of the triangle. If the triangle was a right triangle (ABC = 900), AC 2 = AB 2 + BC 2 . Since the AC 2 > AB 2 + BC 2 , ... a side is 73. Column B: If side = X, then diagonal of a face = (X 2 + X 2 )1 /2 = (2) 1 /2 X. 72 = 23 6 = 6 (2) 1 /2 X = 6 and so the volume is 63, which is smaller than the volume...