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# ? 4 ? ????????????? - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '? 4 ? ?????????????' - raphael-ford

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C

2.5cm

2.5cm

A

D

E

B

40°

40°

3.5cm

3.5cm

（1）两边及夹角

3.5cm

3.5cm

2.5cm

2.5cm

40°

40°

A

D

E

B

(2)两边及其中一边的对角

C

A

B

A

40°

B

D

C

D

C

(2)

F

40°

E

(1)

△ABC≌△EFD (SAS)

D

E

F

H

C

B

D

A

E

D

C

B

A

A

D

E

B

C

1

F

C

4

E

AC∥FD吗？为什么？

B

3

D

A

1. 今天我们学习哪种方法判定两三角形全等？

2. 通过这节课，判定三角形全等的条件有哪些？

SSS，SAS，ASA，AAS

3.在这四种说明三角形全等的条件中，你发现了什么？

“边边角”不能判定两个三角形全等