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Question

In the following figure, ABCD is a parallelogram. If E is the mid-point of BC and AE is the bisector of ∠A, then prove that AB = 12 AD.

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Solution



Given: In a parallelogram ABCD, E is the mid-point of BC and AE is the angle bisector of A.To prove: AB=!2ADProof:As, AE is the angle bisector of A DAE=BAEbut DAE=AEB Alternate interior anglesSo, BAE=AEBAB=BE .....i Sides opposite to equal angles are equalAlso, E is the mid-point of BCBE=12BCAB=12BC Using ibut AD=BC Opposite sides of a parallelogram ABCD AB=12AD

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