As shown in the figure, in the parallelogram ABCD, AE bisects ∠ bad, CF bisects ∠ BCD, points E and F are on BD, connecting AF and CE, indicating that the quadrilateral aecf is parallel How else can you make a diagonal BD with two points e, f being quadrilateral and aecf being parallelogram

As shown in the figure, in the parallelogram ABCD, AE bisects ∠ bad, CF bisects ∠ BCD, points E and F are on BD, connecting AF and CE, indicating that the quadrilateral aecf is parallel How else can you make a diagonal BD with two points e, f being quadrilateral and aecf being parallelogram


The results show that: ABCD is a parallelogram, ∵ ad = BC, AD / / BD, ∵ DAB = ∵ BCD, then ∵ ade = ∵ CBF, ∵ DAE = (1 / 2) ∵ DAB = (1 / 2) ∵ DCB = ∵ BCF ≌ △ BCF, so AE = CF extends AE intersection CD to g, then