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AE is parallel to CD and AD is parallel to EC
So quad AECD is a parallelogram
thus AD = EC :- 1
given ABCD is an isosceles trapezium
so AD = CB :- 2
FROM 1 and 2
EC = CB
In triangle ECB, EC = BC
so angle E = angle B = 65°
So quad AECD is a parallelogram
thus AD = EC :- 1
given ABCD is an isosceles trapezium
so AD = CB :- 2
FROM 1 and 2
EC = CB
In triangle ECB, EC = BC
so angle E = angle B = 65°
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