已知如图,在△ABC中,BD⊥AC于D,CE⊥AB于E,BF=CF求证EF=DF
人气:353 ℃ 时间:2019-08-21 04:32:55
解答
证明:
∵BD ⊥AC ,CE ⊥AB
∴⊿BCE 和⊿BCD均是Rt⊿
∵BF=CF
则EF和DF为两个Rt⊿斜边的中线
∴EF=½BC,DF=½BC
∴EF=DF
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