Answer: The answers are equal and 
Step-by-step explanation: We are given the steps with some missing words for the derivation of the volume of a cylinder. The figure shows a rectangular prism and a cylinder.
The complete steps are as follows:
The rectangular prism and the cylinder have <u>equal</u> heights.
The area of the base of the rectangular prism and every cross section parallel to its base is
.
The area of the base of the cylinder and every cross section parallel to its base is
.
By Cavalieri's principle, this rectangular prism and this cylinder have equal volumes.
The volume of the rectangular prism is
Therefore, the volume of the cylinder is
Thus, the steps are completed.