Prove that the radii of the circles x2+y2=1,x2+y2−2x−6y−6=0 and – InterviewSolution

1.	Prove that the radii of the circles x2+y2=1,x2+y2−2x−6y−6=0 and x2+y2−4x−12y−9=0 are in A.P
Answer» Prove that the radii of the circles $x^{2} + y^{2} = 1, x^{2} + y^{2} - 2 x - 6 y - 6 = 0$ and $x^{2} + y^{2} - 4 x - 12 y - 9 = 0$ are in A.P

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