This zigzag crystal vase has a height of 12 inches. The cross sections parallel to the

base are always rectangles that are 5 inches wide by 4 inches long.

(a) If we assume the crystal itself has no thickness, what would be the volume of the

base?

A cubic inches

(b) The crystal is actually half an inch thick on each of the sides and on the bottom.

Approximately how much space is contained within the vase?

A cubic inches