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radius

segment in a circle or sphere from its center to its perimeter or surface and its length

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About radius

In classical geometry, a radius of a circle or sphere is any of the line segments from its center to its perimeter (circle) or surface (sphere), and, in more modern usage, it is also their length. The radius of a regular polygon is the line segment or distance from its center to any of its vertices. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel. The typical abbreviation and mathematical symbol for radius is R or r. By extension, the diameter is defined as twice the radius:

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Facts from Wikidata (CC0). Image by Dimitris131 via Wikimedia Commons (CC0).

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