Cavalieri's Principle

This 3-D model is composed of a base with two posts on it, one straight up and the other at a slant. The other components include two sets of circular rings, one set of 10 with height of 4mm and another set of 5 with height 8mm. The manipulative is used to demonstrate Cavalieri's principle, which states that when two objects have equal height and are divided into sections by planes parallel to and equal distance from the base, if those sections have equal volumes, than the total volume of the t