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ra·di·an AHD[rāʹdē-ən] D.J.[ˈreɪdiːən]K.K.[ˈrediən]n.Abbr. radMathematics （名词）缩写 rad【数学】   radianWhen the length of an arc of a circle is equal to the radius of the circle, the angle subtended by that arc equals one 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
- radi(us) radi(us)
- -an 1-an1
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