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10.1 1


1.
2.
(SAS) (ASA) (SSS)
() 1△ABC △A’B’C’AB=A’B’,∠B=∠B’, ∠C=∠C’. △ABC≌△A’B’C’
2
1 AB CD O OA=ODOC=OB △OAC≌△ODB
1M AB ∠C=∠D∠1=∠2 △AMC≌△BMD
2 94 1
2∠1=∠2∠C=∠DAC=BD.
1 ABCD AC ∠BADAB=ADAC ∠BAD
2 94 10.1
1.,△ABC≌△DEF ( )
A. AB=DEBC=EF∠A=∠D B. ∠A=∠D∠C=∠DAC=DF
C. ∠B=∠E∠A=∠DAC=EF D. AB=DEBC=EF∠B=∠D
2.5×5 ,1 ,△ABC ()△
ABC
?
3., ABCDE ,∠BCD=∠EDC=90
BC=EDAC=AD.
(1)△ABC≌△AED
(2)∠B=140? ∠BAE

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