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radian    
n. 弧度

弧度

radian
弧度

radian
弧度 弪

radian
n 1: the unit of plane angle adopted under the Systeme
International d'Unites; equal to the angle at the center of
a circle subtended by an arc equal in length to the radius
(approximately 57.295 degrees) [synonym: {radian}, {rad}]



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