Because there is a parallelogram ABCD M N is the midpoint of AB DC.

So DN is parallel, equal to MB, so there is parallelogram DNMB

So FM is parallel to NE

Because am = NC be⊥ac. df⊥ac.

So ∠AFM=∠NEC=90 degrees

Because parallelogram DNMB, ∠FMA=∠ENC

So △ AFM △ nec

So FM=NE

Because FM is parallel, it is equal to NE.

So there is the parallelogram MENF.