Exercise · ZW-GREENS-THEOREM-010 · ★★★ Advanced

Compute \(\oint_C x\,dy\) over the counterclockwise boundary of the triangle with vertices \((0,0)\), \((4,0)\) and \((0,3)\).

Choose one option.

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  • C. \(6\)

Explanation

By Green the integral is the area of the triangle, \(\tfrac12\cdot4\cdot3=6\).

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Review the concept: Green's Theorem

Green's theorem equates the circulation of a field \(\mathbf F=\langle P,Q\rangle\) along a simple closed curve \(C\), counterclockwise, with a double integral over its region \(D\), with respect to area \(A\).

\[\oint_C P\,dx+Q\,dy=\iint_D\left(\frac{\partial Q}{\partial x}-\frac{\partial P}{\partial y}\right)dA\]

More practice problems: green's theorem

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