Sphere -- from Wolfram MathWorld
https://mathworld.wolfram.com/topics/Geometry.html
WEBApr 13, 2024 · A sphere is defined as the set of all points in three-dimensional Euclidean space R^3 that are located at a distance r (the "radius") from a given point (the "center"). Twice the radius is called the diameter, and pairs of points on the sphere on opposite sides of a diameter are called antipodes.
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