Question

How do you find the radius of a sphere when given the surface area?

Answer 1

divide the surface area by 4pi and square root it.

Explanation:

let r be the radius
the surface area of a sphere is 4 x pi x `r^2`
thus, to find the radius, firstly, divide the surface area by 4 and pi, and you'll get `r^2`
to get r, square root `r^2`.