What is the length of the common chord of two circles of radii 12 cm and 16 cm, where distance between their centers is 20 cm?
Let radius of circle with center A be r 1 and circle with center C be r 2 , and AC = d be the distance between the centers. We know the length of the common chord of two circles = 2r1r2/d = 2 * 12 * 16/20 = 19.2 cm