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Math Help - equation of a circle

  1. #1
    Junior Member ihmth's Avatar
    Joined
    Jan 2008
    Posts
    44

    equation of a circle

    How to solve the equation of a circle, given with three points that passes through the circle?
    And if possible, can anyone give me an example?

    thnx
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  2. #2
    Senior Member
    Joined
    Nov 2007
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    (x-u)^2+(y-v)^2=r^2
    Just substitute the given (x,y) pairs into the equation above. You get three equations and need to solve for u, v, r.
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