Question

The surface area of a sphere is found using the formula SA=4πr^2, where r is the radius. If the surface area of a sphere is 64π square feet, what is the radius, in feet?

Answer 1

SA =  $4 \pi r^{2}$
$64 \pi = 4 \pi r^{2}$
$16= r^{2}$
$r^{2}=16$
$r=4$