Question

This sphere has a radius of 9 m. What is the surface area of the sphere? Enter your answer, in exact form, in the box

Answer 1

$\textit{surface area of a sphere}\\\\ SA=4\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=9 \end{cases}\implies SA=4\pi (9)^2\implies SA=324\pi$