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
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