如图,在四边形ABCD中,∠A=∠C=90°.BE平分∠ABC,DF平分∠ADC,BE和DF有什么位置关系,为什么?

平行∵∠A = ∠C = 90°,四边形内角和=360°∴∠ABC + ∠ADC = 180°∵BE平分∠ABC,DF平分∠ADC∴2∠ABE+2∠FDE = 180°∴∠ABE+∠FDE = 90°∵∠A =90°∴∠ADF+∠AFD =90°∵FD平分∠ADC∴∠ADF = ∠FDE∴∠AFD = ...