small and big circles

Geometry Level 2

In the figure shown above, the small circle has its center at PP while the big circle has its center at CC. If PA=3,BC=4,PA=3,BC=4, and PC=6PC=6, what is the length of AB?AB?

If your answer is of the form ab,\frac{a}{b}, where aa and bb are coprime positive integers, find a+b.a+b.

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