Question

Gaelic football is played with a ball with a radius of 5 inches. What is the surface area of the ball used in Gaelic football? (Use 3.14 for π.)

Answer 1

$\bf \textit{surface area of a sphere}\\\\ SA=4\pi r^2~~ \begin{cases} r=radius\\ -----\\ r=5 \end{cases}\implies SA=4\pi 5^2\implies SA=100\pi$