Well, it's just the area of a unit circle.
这就等于一个单位圆的面积。
And we will say, we are on the unit circle.
我们在单位圆上。
That is a circle of radius 1. That's the unit circle.
是一个半径为1的圆，那是单位圆。
So, that means that here, we actually have the unit circle.
也就是我们在这里得到了单位圆。
Let's do the second part, which is a portion of the unit circle.
让我们来做第二部分，这是单位圆上的一段圆弧。
Let's do the second part, which is a portion of the unit circle.
让我们来做第二部分，这是单位圆上的一段圆弧。
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