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Let P(x1, y1) be any point on C1. (x1 - x)2 + (y1 - y)2 = (r1 - r2)2 (x - x2)2 + (y - y2)2 = (r2 - r3)2 Eliminating x, y between the above two equations, we get (x1 - x2)2 + (y1 - y2)2 = (r1 - r2)2 + (r2 - r3)2 This is the equation of tangent from P to C2. Similarly, eliminating x, y between (x1 - x

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