Question

A sphere has radius 2. 7cm. What is its surface area to the nearest sqaure cenitmeter

Answer 1

`\textit{surface area of a sphere}\\\\ SA=4\pi r^2 ~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=2.7 \end{cases}\implies SA=4\pi (2.7)^2\implies SA\approx 91.61~cm^2`