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Math Help - RADIUS length of circle

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    RADIUS length of circle

    The radius length of the circle with equation x^2 + y^2 + 2gx + 2fy + c = 0 is:

    A) c
    B) -c
    C) g^2 + f^2 - c
    D) √( g^2 + f^2 - c)
    E) g + f
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  2. #2
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    Quote Originally Posted by Joker37 View Post
    The radius length of the circle with equation x^2 + y^2 + 2gx + 2fy + c = 0 is:

    A) c
    B) -c
    C) g^2 + f^2 - c
    D) √( g^2 + f^2 - c)
    E) g + f
    Completeing squares (x+g)^2 + (y+f)^2=?
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