how to find the center of concentric circle
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Two circles or more than that are said to be concentric if they have the same centre but different radii. Let, x2 + y2 + 2gx + 2fy + c = 0 be a given circle having centre at (- g, - f) and radius = √g2+f2−c. Similarly, the equation of a circle with centre at (h, k) and radius equal to r, is (x - h)2 + (y - k)2 = r2.
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