# 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 â€“

 [ A ]    20 [ B ]    24 [ C ]    30 [ D ]    34
 Answer : Option C Explanation :