角用度作为单位进行度量,叫角度制(degree measure);角也可以从另外一个角度来度量,叫弧度制(radian measure),弧度制是将长度等于半径长的弧所对的圆心角叫做1弧度来定义的。
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We'll adapt the convention that we'll measure angle in a radian.
我们要适应它,以后都用弧度来表示角的大小
Okay. For those who have not seen a radian, it's just another way to measure angle with the understanding that a full circle, which we used to think is 360 degrees, So a radian is roughly 60 degrees.
我想告诉那些还不懂弧度制的同学,这是衡量角度的另一种方法,理解起来是这样的,对于一个整圆,也就是我们之前所说的360°,所以1弧度大约是60°
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