A sphere is the set of all points in space at a given distance from a given point. The given distance is called the radius and the given point is the center.
Half of a sphere is called a hemisphere .
The surface area of a sphere is times the square of the radius.
Find the surface area of a sphere with a radius of
The volume of a sphere is four-thirds pi times the cube of the radius.
Find the volume of a sphere with a radius cm.