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Radian is the standard unit of angular measurement. A straight angle is Pi radians. This means that 1 radian = 180/pi degrees. A full circle has 2*Pi radians (360 degrees).

All angle parameters and results of trigonometric functions are in radians.

See also


  • CycleToRad Convert cycle angle to radians angle.
  • DegToRad Convert degree angle to radians angle.
  • GradToRad Convert grads angle to radians angle.
  • RadToCycle Convert radians angle to cycle angle.
  • RadToDeg Convert radians angle to degrees angle.
  • RadtoGrad Convert radians angle to grads angle.