1.

The radii of two concentric circles 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. The length of AD is

A. 20 cm
B. 19 cm
C. 18 cm
D. 17 cm
Answer» C. 18 cm


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