已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.(答好有追问)已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.(1)CE=CF (2)E
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/25 06:34:54
已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.(答好有追问)已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.(1)CE=CF (2)E
已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.(答好有追问)
已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.
(1)CE=CF
(2)EF∥AB
要过程
答好有追加悬赏
已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.(答好有追问)已知:如图1,点C为线段AB上一点,△ACM,△CBN都是等边三角形,AN交MC于点E,BM交CN于点F.(1)CE=CF (2)E
∠BAM=∠BCN=60°,∠ACM=∠ABN=60°
=>AM//CN,CM//BN
∠AEM=∠CEN,∠CFM=∠BFN
=>△AEM∽△CEN,△CFM∽△BFN
=>ME:EC=AM:CN,MF:FB=CM:BN
AM=CM,CN=BN
=>AM:CN=CM:BN
=>ME:EC=MF:FB
=>EF//CB (2)
=>∠CFE=∠BCF,∠CEF=∠ACE
=>∠CEF=∠CFE
=>CE=CF (1)
图呢?
∠BAM=∠BCN=60°,∠ACM=∠ABN=60°
=>AM//CN,CM//BN
∠AEM=∠CEN,∠CFM=∠BFN
=>△AEM∽△CEN,△CFM∽△BFN
=>ME:EC=AM:CN,MF:FB=CM:BN
AM=CM,CN=BN
=>AM:CN=CM:BN
=>ME:EC=MF:FB
=>EF//CB (2)
=>∠CFE=∠BCF,∠CEF=∠ACE
=>∠CEF=∠CFE
=>CE=CF (1)