Q. 54.8( 4 Votes )

If ABCD is

Answer :

Since, ABCD is a cyclic quadrilateral with AD BC

Then,


A + C = 180o (i) (Opposite angles of cyclic quadrilateral)


And,


A + B = 180o (ii) (Co. interior angles)


Comparing (i) and (ii), we get


B = C


Hence, proved


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