Green’s Theorem

$$ \oint_{\mathcal{C}} \vec{F}(x,y) \ \mathrm{d\vec{r}} = \int_{a}^{b}\vec{F}(x(t),y(t)) \cdot \vec{r}'(t) \mathrm{dt} = \oint_\mathcal{C} f_{1}(x,y) \mathrm{dx} + f_{2}(x,y) \mathrm{dy} = \iint_{R} \frac{\partial f_{2}}{\partial x} - \frac{\partial f_{1}}{\partial y}\ \mathrm{dA} $$

Curve segments are always integrated counter clockwise. Meaning the bounded region is always in the left. 200

You can go clockwise by simply making the expression negative.

Example


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