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Write the equation of the circle. Center at (4,2) and the circle passes through the point (-1,-1).

Please help!

  • Algebra - ,

    recall the equation of a circle with centre (h,k) and radius r is
    (x-h)^2 + (y-k)^2 = r^2
    (x-4)^2 + (y-2)^2 = r^2
    but (-1,-1) lies on it
    sub x=-1 and y=-1 to find r^2

    let me know what you get.

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