单词 | 圆心角 |
释义 | 〔radian〕A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17′44.6". See table at measurement 弧度:平面角的一种衡量单位,其大小为长度等于半径的弧对的圆心角,1弧度角约等于57°17′44.6" 参见 measurement |
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