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Math Help - Cartesian to Polar

  1. #1
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    Cartesian to Polar

    x^2 + y^2 = 9

    Can I just say that r^2 = 9, r = 3. Is this the polar equation? Seems a bit easy.

    Cheers.
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  2. #2
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    Quote Originally Posted by Sprintz View Post
    x^2 + y^2 = 9

    Can I just say that r^2 = 9, r = 3. Is this the polar equation? Seems a bit easy.

    Cheers.
    Yes, it's that easy.
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  3. #3
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    Ah, thanks. How about this one:

    x + y = 9.

    Should I state (t = theta):

    rcost + rsint = 9
    r = 9/(cost + sint)

    Or is there a better way to express this? Thanks.
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  4. #4
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    Quote Originally Posted by Sprintz View Post
    Ah, thanks. How about this one:

    x + y = 9.

    Should I state (t = theta):

    rcost + rsint = 9
    r = 9/(cost + sint)

    Or is there a better way to express this? Thanks.
    That's the answer.
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