How do you find the raduis of a sphere if you know the surface area?

Use this formula: 4 x pi x radius2

4*pi*radius2

Surface area of a sphere = 4*pi*radius2

Find the surface area of the full sphere [ A = 4 pi R2 ] and then take half of it. You wind up with [ 2 pi R2 ] for the outside surface area of a half sphere, or [ 4 pi R2 ] for the (inside +...

Using the formula for the surface area of a sphere, which is SA = 4 (pi) r2, youcan find the radius, and the diameter of the sphere is twice the radius.Example:If the surface of a sphere is 380...