So, 360 degrees -- which is a full circle’s worth of angles -- would be 2 pi radians.

所以， 360 度——一个完整圆的角度——将是 2 pi 弧度。

180 degrees -- or half a circle's worth of angles -- would be pi radians.

180度——或半圈—— 等于 pi 弧度。

180 degrees -- or half a circle’s worth of angles -- would be pi radians.

180 度——或半个圆的角度——将是 pi 弧度。

So, 360 degrees -- which is a full circle's worth of angles -- would be 2 pi radians.

所以，360度——一个完整的圆—— 它将等于 2 x pi 弧度。

Radians describe angles by essentially telling you how much of that circumference is covered by a given angle.

弧度通过告诉你来描述角度 角所覆盖的周长。

And one revolution is equal to the circumference of the circle: 2 pi radians.

2 x pi 弧度。

And to convert any number of degrees to radians, you just multiply the degrees times pi and divide by 180.

要将任意数量的度数转换为弧度，只需 将分数乘以 pi，然后将结果除以 180。

That unit is called the radian, and its name comes from the fact that it’s based on the radius of a circle.

该单位称为弧度， 其名称来源于它基于圆的半径这一事实。

In uniform circular motion, we’ve described it as the number of radians per second that the marble covers as it moves around the ring.

在匀速圆周运动中，我们将其描述为弹珠绕环移动时每秒覆盖的弧度数。