In Fig. 10.76, C P and C Q are tan...

In Fig. 10.76, `C P` and `C Q` are tangents from an external point `C` to a circle with centre `O` . `A B` is another tangent which touches the circle at `R` . If `C P=11 c m` and `B R=4c m` , find the length of `B C` . (FIGURE)

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