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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

19 cm

B

20 cm

C

16 cm

D

`sqrt(105)` cm

Text Solution

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The correct Answer is:
A
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