1.

The radius of two concentric circles are 17cm and 10cm. A straight line ABCD intersects the larger circle at the point A and D and intersects the smaller circle at the points B and C. If BC = 12 cm, then the length of AD (in cm) is :

A. 20
B. 24
C.
D. 30
E. 34
Answer» D. 30


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