Let \( C_{1} \) and \( C_{2} \) are circles defined by \( x^{2}+y^{2}-20 x+64=0 \) and \( x^{2}+... VIDEO
Let \( C_{1} \) and \( C_{2} \) are circles defined by \( x^{2}+y^{2}-20 x+64=0 \) and \( x^{2}+y^{2}+30 x+144=0 \).
(W)
The length of the shortest line segment \( P Q \) that is tangent to \( C_{1} \) at \( P \) and to \( C_{2} \) at \( Q \) is -
(A) 15
(B) 18
(C) 20
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