cid bfbdb05efd0651afdb22bbd35af9d68100171c1ea50acf7de1f3db7081a956b3 · original · open access · via wikipedia
Title: Radius Authors: Venue: Wikipedia Year: unknown Canonical: wiki:radius URL: https://en.wikipedia.org/wiki/Radius Collector: wikipedia OA: true ABSTRACT 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: