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Math Help - circle equation

  1. #1
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    Jul 2007
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    Unhappy circle equation

    Can someone explain to me how to find the center and radius of the circle: (x+5)^2 + (y-5)^2 = 100 ???
    I'm a little confused.
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  2. #2
    MHF Contributor red_dog's Avatar
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    The equation of a circle of radius r and the center in the point of coordinations (a,b) is
    (x-a)^2+(y-b)^2=r^2
    So, you must to identify a,b,r. Can you do it?
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