Volume of a Frustum

Volume of frustum=____.

Volume of frustum of right circular cone

Derive the formula for the volume of the frustum of a cone.

Write the formula for volume of the frustum of the Cone

Derive the formula for the volume of the frustum of a cone.

Derive the formula for the volume of the frustum of a cone, using the symbols explain.

The radii of the frustum of a right circular cone are in the ratio 2 : 1. What is the ratio of the volume of the frustum of the cone to that of the whole cone ?