Prove that the radii of the circles x^2 + y^2 = 1

MATHEMATICS · Subjective · CBSE · Mathematics · Conic Sections · Conic Sections

Problem

Prove that the radii of the circles x2+y2=1,x2+y2−2x−6y=6andx^2 + y^2 = 1, x^2 + y^2 - 2x - 6y = 6 \quad \text{and} x2+y2−4x−12y=9 are in AP.x^2 + y^2 - 4x - 12y = 9 \text{ are in AP.}

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