A regular square pyramid has a volume of 252 cubic feet.
It's height is 7 feet. Find the length of one side of the
square base.
Round your answer to the nearest tenth of a foot.
A cone which is 12" in height and which has a radius of 6" sits
inside a cylinder which is the same height and which has the same
radius. What is the volume of the "empty space" inside the
cylinder?