**Radian**

A unit for measuring angles. 180° = π radians, and 360° = 2π radians. The number of radians in an angle equals the number of radii it takes to measure a circular arc described by that angle.

Note: 360° equals 2π radians because a complete circular arc has length equal to 2π times the radius.

Formula: θ =
| |

Example:
θ = 10/5 = 2 radians |

Commonly used angles in degrees and radians

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