Example:
Find the volume of the sphere of radius 21 cm. Solution: Volume of the sphere = 4/3 * pi * r^{3}
Given that,
radius = 21 cm.
i.e., = 4/3 * 22/7 * 21 * 21 * 21
= 38808 cu. cm.

Directions: Solve the following problems. Also write at least 5 examples of your own.