# Sphere

A **sphere** is a shape in space that is like the surface of a ball. Most of the time, the terms ball and sphere are used as the same. But in mathematics, the precise (exact) definition only allows points in the 3 dimensional space which are uniformly and symmetrically located at a fixed length called radius of the sphere.

Examples of these are basketballs, superballs, and playground balls.

A sphere is the 3 dimensional analogue of a circle.

## Volume[change | change source]

The volume (V) of a sphere is given by the following formula

where *r* is the radius of the sphere.

## Surface area[change | change source]

The surface area (A) of a sphere is given by the following formula

where *r* is the radius of the sphere.

## Equation of a sphere[change | change source]

In Cartesian co-ordinates, the equation for a sphere with a center at (x_{0}, y_{0}, z_{0}) is as follows:

where r is the radius of the sphere.