Q. 175.0( 2 Votes )

In Fig. 16.188, <

Answer :

FDC + CDA = 180o (Linear pair)

80o + CDA = 180o


CDA = 100o


Since, ABCD is a cyclic quadrilateral


ADC + ABC = 180o


100o + ABC = 180o


ABC = 80o


Now,


ABC + ABF = 180o (Linear pair)


80o + x = 180o


x = 180o – 80o


= 100o


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