国际单位制中平面角的导出单位:圆心角所对的弧长等于半径时,该角为1弧度。
radians — plural of radian
平面角单位,国际单位制采用；大小等于半径长的弧所对的圆心角,约57.295度；弧度；[计] 弧度
国际单位制中平面角的导出单位:圆心角所对的弧长等于半径时,该角为1弧度。
In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle.
平面角单位,国际单位制采用；大小等于半径长的弧所对的圆心角,约57.295度
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)
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