Question

If the radius of a sphere $3r$, then What is its volume?

Answer 1

Given that,

Radius of the sphere $=3r$

Volume of the sphere $=\frac{4}{3}\pi R^3$

$=\frac{4}{3}\pi (3r{)}^3$

$=\frac{4}{3}\pi 27r^3$

$=36\pi r^3$