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[[Image:Sphere-wireframe.png|right|thumb|200px|A [[wireframe]] sphere.]]
[[Image:Sphere-wireframe.png|right|thumb|200px|A [[wireframe]] sphere.]]
A '''sphere''' is the set of all points in three-dimensional [[euclidean space]] ('''R'''<sup>3</sup>) which are at a fixed distance ''r''(called radius) away from a point called the center.
A '''sphere''' is the set of all points in three-dimensional [[euclidean space]] ('''R'''<sup>3</sup>) which are at a fixed distance ''r'' (called radius) away from a point called the center.
[[category:geometry]]
[[category:geometry]]