如图所示,平行四边形ABCD中,AD=2AB,EA=AB=BF,求证;CE垂直于DF.
如图所示,平行四边形ABCD中,AD=2AB,EA=AB=BF,求证;CE垂直于DF.
其他人气:773 ℃时间:2019-11-01 06:07:40
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分析:因为∠ADC与∠BCD是同旁内角且互补,要求CE⊥DF,可先求DF、CE分别平分∠ADC和∠BCD.证明:∵AD=2AB,AB=BF,∴AD=AF,∠3=∠F.∵四边形ABCD是平行四边形,∴DC∥AB,AD∥BC.∴∠1=∠F.∴∠1=∠3.同理,∠2=∠4....
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