radian是什么意思

音标:英 [ˈreɪdɪən]美 [ˈredɪən]

弧度[计] 弧度

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)

radian的用法和例句：

1. If they're not set to radians, you're gonna have a bad time.

如果没有设置为弧度 那可就糟了

2. Sometimes in radians, sometimes in degrees, depending on my level of whimsy.

有时用弧度 有时用角度数 看我那天心情如何啦

3. Everybody check and make sure your graphing calculators are set to radians.

大家检查一下 确定 你们的图形计算器已经设定为弧度