Turn (angle)

A turn is a unit of plane angle measurement equal to  radians, 360 degrees or 400 gradians. Subdivisions of a turn include half-turns, quarter-turns, centiturns, milliturns, etc.

Unit ofPlane angle
1 tr in ...... is equal to ...
   radians   2π rad
6.283185307... rad
   milliradians   2000π mrad
6283.185307... mrad
   degrees   360°
   gradians   400g
Counterclockwise rotations about the center point where a complete rotation corresponds to an angle of rotation of 1 turn.

The closely related terms cycle and revolution are not equivalent to a turn, since these are not units of angle.

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