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.