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 = s/r
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![]() | Example: s = 10 θ = 10/5 = 2 radians |
Commonly used angles in degrees and radians
See also
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