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Math Help - Polar form

  1. #1
    Junior Member
    Joined
    Jul 2009
    Posts
    51

    Polar form

    Convert the equation to polar form..... Plz explain
    #1 x^2+y^2=9


    #2 y=5


    Convert the polar to rectangular coordinates

    #3 r^2=sin2(theta)

    #4 r=1/(1+sin(theta))
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  2. #2
    Super Member
    Joined
    May 2009
    Posts
    527
    Use the following to convert:

    Polar to rectangular:
    x = r\cos \theta
    y = r\sin \theta

    Rectangular to polar:
    r = \sqrt{x^2 + y^2}
    \theta = \tan^{-1} \left(\frac{y}{x}\right)

    So...
    #1:
    x^2 + y^2 = 9
    r^2 = 9
    r = 3


    01
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  3. #3
    Junior Member
    Joined
    Jul 2009
    Posts
    51
    I got it to R=3 im not sure what to do from there or is that it?
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