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A unit of angular measure in which the Angle of an entire Circle is $2\pi$ radians. There are therefore 360° per $2\pi$ radians, equal to $180^\circ/\pi$ or 57.29577951°/radian. A Right Angle is $\pi/2$ radians.

See also Angle, Arc Minute, Arc Second, Degree, Gradian, Steradian

© 1996-9 Eric W. Weisstein