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given: ABCD is a parallelogram and AB = 10 cm; AD = 6 cm
AE is the angle bisector of angle A.
∠DAF=∠AFB [alternate interior angles]
∠DAF=∠FAB [since AE is the angle bisector of angle A]
⇒∠AFB=∠FAB
in the triangle AFB;
∠AFB=∠FAB⇒BF=AB=10cm
[since sides opposite to equal angles are equal]
BC = AD = 6 cm [opposite sides of a parallelogram are equal]
CF = BF - BC
= 10 - 6
= 4 cm
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