radian
英['reɪdɪən]
美['redɪən]
- n. [数] 弧度
- n. (Radian)人名；(罗)拉迪安
英英释意
- 1. 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)