如果运用一下格林公式，你就发现当沿着一个逆时针的曲线时，结果就是区域的面积。

And, now, if you apply Green's theorem, you see that when you have a counterclockwise curve, this will be just the area of the region inside.

youdao

如果运用一下格林公式，你就发现当沿着一个逆时针的曲线时，结果就是区域的面积。

And, now, if you apply Green's theorem, you see that when you have a counterclockwise curve, this will be just the area of the region inside.

youdao