Think of a trapezoid with b1 and b2 as the length of the bases, h as the length of the altitude, and a as the area. find the missing parts.

b1 b2 h a
6 x 2 18

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap