29. The radii of two concentric circles are 13 cm and 8 cm. AB is a diameter of the bigger circle and BD is tangent to the smaller circle touching it at D and intersecting the larger circle at P, on producing. Find the length of AP.
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https://www.meritnation.com/ask-answer/question/the-radii-of-two-concentric-circles-are-13cm-and-8cm-a/quadratic-equations/3934850
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