• Well, it's just the area of a unit circle.

    这就等于一个单位面积

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  • And we will say, we are on the unit circle.

    我们单位圆上

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  • That is a circle of radius 1. That's the unit circle.

    一个半径为1单位圆。

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  • So, that means that here, we actually have the unit circle.

    也就是我们在这里得到单位

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  • Let's do the second part, which is a portion of the unit circle.

    我们来第二部分单位圆上段圆弧

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  • Let's do the second part, which is a portion of the unit circle.

    我们来第二部分单位圆上段圆弧

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