Question

A rectangle with vertices at (2,5), (7,5), (7,8) and (2,8) is revolved around the line y=5 to obtain a cylinder. What is the volume of the cylinder? Express your answer in terms of pi.
Reiny
After making a sketch you will see that the radius would be 3 and the height would be 5
V= πr^2h
= π(9)(5) = 45π