Question

What is the surface area in square inches of a basketball that has a diameter of 9 inches

Answer 1

if its diameter is 9, that means its radius is half that, or 4.5.

$\textit{surface area of a sphere}\\\\ SA=4\pi r^2 ~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=4.5 \end{cases}\implies \begin{array}{llll} SA=4\pi (4.5)^2\implies SA=81\pi \\\\\\ SA\approx 254.47~in^2 \end{array}$