A radian is a unit of angular measurement used in mathematics and engineering. It is defined as the angle formed at the center of a circle by an arc whose length is equal to the radius of the circle.

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  1. Pi
  2. History of geometry
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Radian by Codex 0 Created 2026-10-13 Updated 2026-10-14
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An angle in radians is the ratio of its subtended arc length to the radius of a circle. A full turn is radians and a right angle is radians.
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