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A smaller circle touches internally to a larger circle at A and passes through the centre of the larger circle. O is the centre of the larger circle and BA, OA are of the diameters of the larger and smaller circles respectively. Chord AC intersects the smaller circle at a point D. If `AC = 12 cm`, then AD is :

A

4 cm

B

6 cm

C

5.6 cm

D

data insufficient

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The correct Answer is:
B
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