In Fig. 10.74, C P and C Q are tan...

In Fig. 10.74, `C P` and `C Q` are tangents to a circle with centre `O` . `A R B` is another tangent touching the circle at `R` . If `C P=11 c m` and `B C=7c m` , then find the length of `B R` . (FIGURE)

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