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A to F G to M N to T U to Z See also: - Circle - Degrees - SI Units |
Radians The radian (symbol c ) is the SI unit for plane angular measure. It is equal to the angle subtended by an arc of unit length at the centre of a circle with unit radius: 
2  radians = 360°1c = 57.2957795131...° 1° = 0.0174532925...c |
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