Please Answer All Sections THANKS!

A) What is the Volume in cubic centimeters of the indentation of the metal part?

B) The company changes the metal part to be in the shape of a cube with the same indentation that is shaped like a hemisphere. The volume of the hemisphere is not changed.

What is the minimum volume, in cubic centimeters of the metal part with the indentation?

C) The Company also makes metal cones and spheres the radius of the circular base of one of the cones is the same as the radius of one of the spheres the cone and the sphere have the same volume.

Explain why the height of the cone must be 4 times the radius of the sphere when the cone and sphere have the same volume and radius.

Here Is AN image of the Question

ImageShack® - Online Photo and Video Hosting
The Picture To The Farthest left side is a triangle with half of a circle indentation , and the middle is a top view and the one to the most right is a cross section view, with a half of a circle