Okay, so the volume of a sphere is 4/3 x pi x r^3.
The diameter of the sphere is 2.5, so the radius is 1.25cm. This cubed is 1.953125.
Multiply that by 3.14 to get 6.1328125. And finally, multiply by 4/3 to get 8.1770. To the nearest hundredth, we get that the volume of the sphere is 8.18cm^3.
Hope this helps:)
