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We know the sum of the opposite angles is 180°.

∠AEC+∠AED = 180 (Linear pair)
∠AED = ∠CBA ... (1)
For a parallelogram, opposite angles are equal.
∠ADE=∠CBA... (2)
From (1) and (2)

∠ means angle

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thanks a lot this will help me tomorrow in exam.
most welcome
AD = AE. Its the answer. i just did it with out steps.
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