In the parallelogram ABCD, E is the midpoint of the side BC; DE and extended AB meet at the point F. The length of AF is equal to
AF = AB + BF,
We can see that ΔBEF ≅ ΔCED by AAA congruency
⇒ BF = CD and CD = AB as ABCD is a parallelogram.
⇒ AF = 2AB
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