| 单词 | 平面角 |
| 释义 | 〔angle〕The figure formed by two planes diverging from a common line.平面角：从一条公共直线出发的两个平面形成的图形〔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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