Question

A cone has its radius(R) equal to its height. What is the volume of its frustum if the smaller cone’s radius is 'r' ?

• A. $\frac{1}{3}\pi R(R^2+r^2+Rr)$
• B. $\frac{1}{3}\pi R(R^3+r^3+2Rr)$
• C. $\frac{1}{3}\pi (R^3-r^3)$
• D. $\frac{1}{3}\pi (R^3-r^2)$

Answer 1

The correct option is C $\frac{1}{3}\pi (R^3-r^3)$