Question

Two concentric circles are of radii 5 cm and 3 cm. Determine the length of the chord of the larger circle which touches the smaller circle.

Answer 1

Answer: 4

Step-by-step explanation:

In triangle OCB,

OB2  =  OC2 + BC2

52  =  32 + BC2

BC2  =  25 - 9

BC2  =  16

BC  =  4