,12.2.2 SAS,SSS,ABC DEF, ABC DEFSSS,1,SSS,𣿼.,(2) ,(1) ,(3) ,(4) ,:,SSS,!,?,A,B,C, A,ABAC,A,B,C,BAC,CAB, ,ABC,ABC,AB=AB, AC=AC, A=A,ABC,ABC,?,:, ABCABC ,: 1. DAE= A,2.ADAB=AB, AEAC=AC;,3. BC.,A,C,B,A,E,C,D,B,2,ABCDEF,ABCDEFSAS,( SAS ),F,E,D,C,B,A,1.,AOBDOC A0=DO,=,BO=CO, AOBDOC( ).,AOB,DOC,SAS,(,A=A,=,A,D,C,B,E,AECADB ,2.AECADB,AB,AC,AD,AE,SAS,SASA,?,AC=10cm,BC=8cm, A=45 .,ABC?,SSA,ABCABC,A,B,D,A,B,C,SSA,SAS), ,SSS, SAS,SSA ,2 ABABCACDCD=CABCECE=CBEDDEAB,B,A,D,E,ABCDEC,AC=DC(),ACB=DCE(),BC=EC(),ABCDECSAS,AB=DE,(),(,SSS, SAS, 1.AB=CB ABD= CBD ABD CBD ,:, ABD CBD,AB=CB(),ABD= CBD(),A,B,C,D,1,: AD=CD,BD=BD(),BDADC,A,B,C,D,2 :AD=CD BD ADC A= C, ,3EFACAD/BCAD=CBAE=CF 1AFDCEB,A=C, ,AD / BC,AD = CB,AE = CF,AF = CE,AD/BC, A=C,AE=CF,AFDCEB,AD=CB,A=C,AF=CE,AFDCEBSAS,AE+EF=CF+EF AF=CE,(,(,(, 1 ACBDOOA=OCOB=ODAOBCOD,2 AC=BDCAB= DBABC=AD,:,2. ,2 (SAS),1,SAS,2,SSSSAS,ACBDOAOBCOD,A,B,C,D,E,AB=ADAC=AEBAD=CAEBC=DE,AB=AC , BAD=CAD ABDACD,A,B,C,D,D,A,B,C,AB=CB,ABD=CBD, ABDCBD,EFBCBE=CFAB=DCB=C A=D,AC=BDCAB= DBABC=AD,:ABCBAD,AC=BD CAB=DBA AB=BA,ABCBADSAS,(),(),(),BC=AD (,ADBC,AE=CF,AD=BC,EFACDEBF,:,AB=CB,ABD=CBD,AD=CD,BD ADC ,D,A,B,C,:AD=CDBDADCA=C,EAADAFD ADDAE=DFAB=DC. CE=BF.,OPMONOM=ONMD=ND. OMP ONP PMD PND PMD=PND.,ACBDCAC=DCCB=CE. DF AB.,A,B,E,F,C,D,AB=AC,AE=AD, 1= 2,:BD=CE.,D,A,C,B,E,CABCE=CD, ACD=BCE,AE=BD,ABACADAEAB=ACAD=AE. DACEAB,E,A,D,C,B,AEBBCDAC ABDEBC,A,B,C,E,D,ABCDCEDBCADBE,ABCDCEDABCADBE,ABCDCED.EABCADBE,ABDACEDC=BE,B,A,C,D,E,ABCDECFBE=DF,1.:壬. 2. . 3., ,