These are two different things....
Here are the "formulas" for the frustum volumes of various objects.....
http://en.wikipedia.org/wiki/Frustum
And here is the "formula" for the volume of a spherical cap
http://en.wikipedia.org/wiki/Spherical_cap
These are two different things....
Here are the "formulas" for the frustum volumes of various objects.....
http://en.wikipedia.org/wiki/Frustum
And here is the "formula" for the volume of a spherical cap
http://en.wikipedia.org/wiki/Spherical_cap