Ononot — Two circles x^2+y^2=r1^2 and x^2+y^2-2ax-2by+c=0 are orthogo

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Circles & Conicshard

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Two circles $x^2+y^2=r_1^2$ and $x^2+y^2-2ax-2by+c=0$ are orthogonal. What is the relation between the constants?