How to find the radius of the sphere

Before the problem of finding the radius of the sphere is necessary to introduce the definition of objects – the sphere and the ball.Of course solid geometry it is known that a sphere is a surface that consists of points in space equidistant from a given point. This point is called the center of the sphere, and the distance at which point the scope away from its centre, the radius of the sphere and is denoted by R. the solid bounded by the surface of the sphere is called a ball. The method of determining the radius of the sphere depends on the available source data.

Instruction

1. Given the scope and the known area of its surface. Then, using the formula to calculate the surface area of the sphere, we can calculate its radius:
   R = v(4•P/S), where S is the surface area of the sphere, P = 3,14.
2. If you know the volume of a sphere, which limits the sphere, the radius can be found by the formula:
   R = (3•V/4•N)^1/3, where V is the volume of a sphere, P = 3,14.