What's the volume of a cylinder with a diameter of 8 and a height of 12

Answer 1

The volume of a cylinder is equal to πr2h, where r is the radius and h is the height. The radius of a cylinder with a diameter of 8 is 4, so the volume of the cylinder is π(4)2(12) = 192π.

Answer 2

V = pi r^2 h
r = 4 so r^2 = 16
V = pi * 16 * 12 = 602.9 which is indeed 192 pi