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.