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altavistard
Supposing the center of the circle is at (h,k) and that the radius is r, the standard equation for the circle is (x-h)^2 + (y-k)^2 = r^2.

If the center is at (1,1) and the radius of the circle is 5, then

(x-1)^2 + (y-1)^2 = 5^2 (answer)

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