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Math Help - rotation

  1. #1
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    rotation

    If C is the circle in the xy plane with radius 2, centre at the origin, find the integral of c for (x+y)dx-(x+y)dy+2zdz.

    to do this, i would need to know the direction in which C is rotating so that i can parametrise C.

    but how do i find out which direction is it rotating?

    my notes states use the right hand rule to find the direction of C...but i have no idea how using this rule will help me find the direction...

    thanks!
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  2. #2
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    Have you considered doing it both ways? It might be a useful exploration.
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  3. #3
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    i assume that the answers would be the same, differing by a factor of -1?

    to prevent that from happening, is there some way i can identify the direction of rotation before choosing my parametrisation?
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