If C1 and C2 are circles whose equations are x2+y2−20x+64=0 and x2+y – InterviewSolution

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1.	If C1 and C2 are circles whose equations are x2+y2−20x+64=0 and x2+y2+30x+144=0, then the length of the shortest line segment PQ that is tangent to C1 at P and to C2 at Q is
Answer» If $C_{1}$ and $C_{2}$ are circles whose equations are $x^{2} + y^{2} - 20 x + 64 = 0$ and $x^{2} + y^{2} + 30 x + 144 = 0$ , then the length of the shortest line segment $P Q$ that is tangent to $C_{1}$ at $P$ and to $C_{2}$ at $Q$ is

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