如图,AB∥CD,∠BED=110°,BF平分∠ABE,DF平分∠CDE,则∠BFD=( ) A.110° B.115° C.125° D.130°
问题描述:
如图,AB∥CD,∠BED=110°,BF平分∠ABE,DF平分∠CDE,则∠BFD=( )
A. 110°
B. 115°
C. 125°
D. 130°
答
过点E作EM∥AB,过点F作FN∥AB,∵AB∥CD,∴EM∥AB∥CD∥FN,∴∠ABE+∠BEM=180°,∠CDE+∠DEM=180°,∴∠ABE+∠BED+∠CDE=360°,∵∠BED=110°,∴∠ABE+∠CDE=250°,∵BF平分∠ABE,DF平分∠CDE,∴∠ABF=12...