math

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how do i write this equation...

circle with center (1,-3) that passes through the point (4,2).

I have (x-1)^2 + (y+3)^2=? how do i get the radius...

  • math -

    complete your equation to
    (x-1)^2 + (y+3)^2= r^2

    but (4,2) lies on your circle, so ...
    (4-1)^2 + (2+3)^2 = r^2

    etc.

  • math -

    thanks:)

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