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The radii of two concentric circle are 1...

The radii of two concentric circle are 13 cm and 8 cm. AB is a diameter of the bigger circle and BD is a tangent to the smaller circle touching it at D and the bigger circle at E. Point A is joined to D. Find the length of AD.

A

20 cm

B

19 cm

C

18 cm

D

17 cm

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B
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