Question

A disco ball is shaped like a sphere with a diameter of 16 inches. To the nearest square inch, what is the surface of the disco ball?

Answer 1

If the diameter is 16 inches, then its radius is half that, r = 8.

$\bf \textit{surface area of a sphere}\\\\ A=4\pi r^2\quad \begin{cases} r=radius\\ -----\\ r=8 \end{cases}\implies A=4\pi 8^2$