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In Fig. 10.72, P A and P B are tan...

In Fig. 10.72, `P A` and `P B` are tangents to the circle drawn from an external point `P` . `C D` is a third tangent touching the circle at `Q` . If `P B=10 c m` and `C Q=2c m` , what is the length `P C` ? (FIGURE)

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