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1、,12.2 (),-SAS, ,1 壻 2 3 ,SSS,ABC DEF, ABC DEFSSS,1 2 SAS 3 SAS,SAS SAS, , A,ABAC, ,3ABCABCAB= A B A C = A C A =A,:,: 1. DAE= A,2.A DA B =AB, A EA C =AC;,3. B C., A B C ABC ,37 ,ABCDEF,ABCDEFSAS,(SAS),F,E,D,C,B,A,?,AC=10cm,BC=8cm, A=45 .,ABC?,A,B,D,A,B,C,SSA,SAS), ,SSS, SAS,1 (1),AOBDOC,AO=D
2、O() _=_( ) BO=CO() AOBDOC , AOB, DOC,SAS,2ACB ADB,AC = A D () CAB=DAB _=_( ),ACBADB, ,AB,AB,SAS,3ABCBAD,AC=BD CAB=DBA _=_( ),ABCBAD ,AB,BA,SAS,4 AECADBAE=ADAC=ABAEC ADB,AE=AD _=_( ) AC=AB AECADB ,SAS,AECADB,A,A,1 EFBCBE=CFAB=DC B=C A=D,BE=CF BE+EF=CF+FE BF=CE,ABFDCE,AB=DC B=C BF=CE, ABFDCE (SAS).,A=
3、D,2 ,2AB=AC,AD=AE,BAC=DAE ABDACE,ABABCACDCD=CA.BCECE=CB.DEDEAB.,3 ,1,SAS,2,SSSSAS,1 : .,2 ,1漰SAS. 2繫,1BDCADCBAD=BAC=90BD=BC,B,D,A,C,BADBAC,BA=BA BAD=BAC AD=AC,BADBAC (SAS).,BD=BC, ADC AD=AC,2 AB=ACABD ACD?.,(1)A=A,AB=AC (),A=A(),AD=A(), AACSAS,(2),AB=AC (),AD=A(), AAC(SSS),BD=CD(),3.AE=AF, AEF= AFE, BE=CF,AB=AC,AB=ACAD=AE. B=C,
