Sphere

A sphere is a round, three-dimensional shape. 
All points on the edge of the sphere are at the same distance from the center. 
The distance from the center is called the radius of the sphere. A real-world sphere is called a globe if it is large (such as the Earth), and as a ball if it is small, like an association football.

Common things that have the shape of a sphere are basketballs, superballs, and playground balls. 
The Earth and the Sun are nearly spherical, meaning sphere-shaped.

A sphere is the three-dimensional analog of a circle.

 Calculating measures of a sphere 

 Surface area 

Using the circumference: 

Using the diameter: 

Using the radius: 

Using the volume: 

 Circumference 

Using the surface area: 

Using the diameter: 

Using the radius: 

Using the volume: 

 Diameter 

Using the surface area: 

Using the circumference: 

Using the radius: 

Using the volume: 

 Radius 

Using the surface area: 

Using the circumference: 

Using the diameter: 

Using the volume: 

 Volume 

Using the surface area: 

Using the circumference: 

Using the diameter: 

Using the radius: 

 Equation of a sphere 

In Cartesian coordinates, the equation for a sphere with a center at  is as follows:

where  is the radius of the sphere.

 Related pages 

 Circle
 Pi
 Tau

Category:Three-dimensional shapes