Given A = πr2S360, solve for S.
\(\sf a=\pi r^2s\times360\\Divide\ by\ \pi r^2\times360\\ \frac{a}{\pi r^2\times360}= \frac{\pi r^2s\times360}{\pi r^2\times360}\\ \frac{a}{\pi r^2\times360}=s\\\\{\boxed{\sf s=\frac{a}{\pi r^2\times360}}\)
