∴ angle CFE= angle DFB

Angle B= angle B∴ angle AEF= angle ADF

AF = AF, angle AEF= angle ADF, angle 1= angle 2.

∴EF=DF

(2)∫ Angle BDE= Angle FDG, BD=DG, DE=DF.

∴△BDE≌△GDF

∴ Angle E= Angle f is ab∨FH.

∴ Angle A= Angle H, Angle ABD= Angle HGD.

BD = DG

∴△ABD≌△HGD

∴AB=HG