# ABCD is a paralle

It is visible that ABCE is a cyclic quadrilateral and in a cyclic quadrilateral, the sum of opposite angle is 1800

AEC = CBA = 180

AED = CBA (i)

We know that: Opposite angles of a parallelogram are equal

Hence,

Using (i) and (ii)

AE = AD (angles opposite to equal sides are equal)

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