Acone has a diameter of 8 units and a height of 8 units. its radius is a. 2 b. 4 c. 8 d. 16 units, and its volume is a. 66.99 b. 133.97 c. 401.92 d. 535.89 cubic units. a cylinder with the same height and radius as the cone will have a volume of a. 66.99 b. 133.97 c. 401.92 d. 535.89 cubic units. if a sphere has the same radius as the cylinder, its volume is a. half b. two-thirds c. four-thirds the volume of the cylinder.