Sphere

:For other uses, see sphere (disambiguation).

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A sphere is a perfectly symmetrical geometrical object. In mathematics, the term refers to the surface or boundary of a ball, but in non-mathematical usage, the term is used to refer either to a three-dimensional ball or to its surface. This article deals with the mathematical concept of sphere.

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In three-dimensional Euclidean geometry, a sphere is the set of points in R3 which are at distance r from a fixed point of that space, where r is a positive real number called the radius of the sphere. The fixed point is called the center or centre, and is not part of the sphere itself. The special case of r = 1 is called a unit sphere.

Symmetrical: REDIRECT symmetry...

Geometrical: REDIRECT Geometry...

Surface: In mathematics (topology), a surface is a two-dimensional manifold. Examples arise in three-dimensional space as the boundaries of three-dimensional solid objects. The surface of a fluid object, such as a rain drop or soap bubble, is an idealisation. To speak of the surface of a snowflake, which has...

Sphere related Images and Photos (experimental)

Sphere	Sphere (BD)	Sphere (DVD)	Sphere (DVD)
Contact/Sphere (DVD) (DBFE) (Multi-Title)	Levitating Sphere	Celestial Sphere circa 1580	Sphere of Colorful Bands c.1919-20
SIF Odin Sphere Gwendolyn Statue	SIF EX Odin Sphere Velvet Statue	SIF EX Odin Sphere Mercedes Statue	Armillary Sphere of the Copernican System 1764