It is known that E and F are two points on diagonal AC of parallelogram ABCD, and be = DF. It is proved that bfde is a parallelogram

It is known that E and F are two points on diagonal AC of parallelogram ABCD, and be = DF. It is proved that bfde is a parallelogram

It is proved that connecting BD and AC at the point O ∵ ABCD is a parallelogram, Bo = do ∵ be ∥ DF ∵ ODF = ∵ OBE, ≌ ofd = ≌ OEB ≌ ODF ≌ OBE ∥ OE = of ∥ bfde is a parallelogram