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1 . The radi i of two concentric circles are 17 cm and 10 cm respectively. A straight line ABCD intersects the larger circle at the point A and D and intersects the smaller circle at the point B and C. If BC = 12 cm, then the length of AD (in cm) is –
[ A ]    20
[ B ]    24
[ C ]    30 right
[ D ]    34
Answer : Option C
Explanation :
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