radian
美['reɪdiən] 英['reɪdiən]
n. 弧度
英英释义
Noun- 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)
例句
用作名词(n.)- A unit of angular distance equals to one thousandth of a radian.一种角距离单位相当于弧度的千分之一。
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