Question

Find the radius of a circle with an area of 380 square inches

Answer 1

$\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\ -----\\ A=380 \end{cases}\implies 380=\pi r^2 \\\\\\ \cfrac{380}{\pi }=r^2\implies \sqrt{\cfrac{380}{\pi }}=r$