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`