ABCD is a cyclic quadrilateral in which AB = 12.5 cm, BC = x cm, CD = 13 cm, AD = 20.8 cm and BD is bisected by AC at O

ABCD is a cyclic quadrilateral in which AB = 12.5 cm, BC = x cm, CD = 13 cm, AD = 20.8 cm and BD is bisected by AC at O, what is the value of x?

(a) 19.352

(b) 20.352

(c) 21.632

(d) 22.642

Sol:

12.5 × x = 13 × 20.8

=>x=13*20.8/12.5

=21.632