# Contour Integral with just straight lines?

1. Dec 6, 2004

### hd28cw

I'm trying to solve this contour integral shown on the attached file, I know usually that they involve curved lines. I know that this is trivial but I need some help with the problem. Please take a look.

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2. Dec 6, 2004

### Tide

You might get more replies if you typed the equations in your message - some of us don't have or use MS Word.

3. Dec 7, 2004

### Galileo

The problem states:

Solve the contour integral $$\oint_C \vec A \cdot d\vec s$$ where $$A=y^2\hat x + 2x \hat y$$.

C is the rectangular contour with vertices (0,0),(2,0),(2,4),(0,4).

You could break the integral up and perform 4 seperate line integrals, noting the direction of the $d\vec s$ in each case or do it the quicky way by applying Green's Theorem.