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1、 ,2 ,SSS,ABC DEF, ABC DEFSSS,1,SSS,𣿼.,(2) ,(1) ,(3) ,(4) ,:,SSS,!,?, , A,ABAC, ,ABCABCA B =AB,A C =A C , A =A, A B C ABC ,: 1. DA E= A,2.A DA B =AB,A EA C =AC;,3. B C.,A,C,B,A,E,D,C,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,AEC
2、ADB ( ).,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,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,3 :AD=CD BD ADC A= C,:AB,A,B,C,E,D,ABC,ACDCD=CA,BCECE=CB,ED,EDAB.,1,2, ,2EFACAD/BCAD=CBAE=CF
3、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),1,2,3,4,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,
4、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,ABCABC,ABCABCSAS,(SAS),C,B,A,C,B,A,SSA,ABCABC,A,B,D,A,B,C,SSA,SAS), ,SSS, SAS,SSA ,ABABCACDCD=CABCECE=CBEDDEAB,B,A,D,E,ABCDEC,AC=DC(),ACB=DCE(),BC=EC(),ABCDECSAS,AB=DE,(),(,SSS, SAS,ACBDOAOBCOD,A,B,C,D
5、,E,AB=ADAC=AEBAD=CAEBC=DE,AB=AC , BAD=CAD ABDACD,A,B,C,D,1,SAS,2,SSSSAS,1.:壬. 2. . 3.,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 A
6、DDAE=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,
