(本小题满分6分)如图,在△ABC和△ADE中,∠BAD=∠CAE,∠ABC=∠ADE。

(本小题满分6分)如图,在△ABC和△ADE中,∠BAD=∠CAE,∠ABC=∠ADE。

1.(1)写出图中两对相似三角形(不得添加辅助线);

2.(2)请分别说明两对三角形相似的理由。

 

答案

 

1.(1)△ABC∽△ADE,△ABD∽△ACE(2分)

2.(2)①证△ABC∽△ADE 

∵∠BAD=∠CAE  ∴∠BAD+∠DAC=∠CAE+∠DAC,

即∠BAC=∠DAE   又∵∠ABC=∠ADE∴△ABC∽△ADE(4分)

②证△ABD∽△ACE

∵△ABC∽△ADE, ∴ 

又∵∠BAD=∠CAE  ∴△ABD∽△ACE(6分)  

解析:略

 

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