3 ,SSS,ABC DEF, ABC DEFSSS,1,2,ABCDEF,ABCDEFSAS,(SAS),F,E,D,C,B,A,A,B,D,A,B,C,SSA,1.AB=ACABD ACD?,ABD ACD,AB=AC,A,B,D,C,BAD= CAD,S,A,S,AD=AD,BD=CD,S,2.ACB ADB ,A,B,C,D,ACB ADB,S,A,S,ACB ADB,AB=AB,CAB= DAB,AC=AD,S,BC=BD, ,A,B,C,A,B,C,1,2,1 ABAB,2 BCA,ABCA B C A B =AB , A = A B = B,:(ASA).,A B C ABC ,: 1. A B =AB,2.A B DA B = A ,EB A = B, A DB EC,A,E,D,C,B,?,:ABCA B C ,A=A AB=A B,ABCABCASA,A,C,B,B=B,(ASA).,ABCDEF A=D, B=E,BC=EF, ABCDEF,A,C,B,E,D,F,ASA?, A=D, B=E(),C=F(),B=E,ABCDEF,BC=EF,C=F,ABCDEFASA,AAS,?,:ABCA B C ,A=A,ABCABCAAS,A,C,B,B=B,ASA,AAS,ASA,ABCDEF. 1A=E AB=EF B=D 2A=D AB=DE B=E,1AB=DE A =D ,B=E ABC DEF,2AB=DE ,A=D,C=F ABC DEF,ASA,AAS,1 . AB=AC,B=C,ABEACD,: ABEACD B=C AB=AC A= A ABE ACD ASA,1.AD=AE,B=CBECD,BE=CD,O,2. ,OAB = ? ,A,B,C,D,O,ABC=DCB3=4: (1)ABCDCB (2)1=2,3,1 AB=A C A=AB=C ABE A CD,A=A AB=AC B=C ,ABE ACD ASA,ABE ACD,1ABDEACDFBE=CFABCDEF, BE=CF(),BC=EF(),B=E,ABCDEF,BC=EF,C=F,ABCDEFASA, ABDE ACDF (), B=DEF , ACB=F, ,ASA,AAS,SAS,SSS,A,B,C,D,E,F,1ACB=DFEBC=EF - ABCDEF ,B=E,A=D, AC=DF,ASA,AAS,SAS,AB=DE,ABDE,(1) .,ASA.,(2) .,AAS.,3 ,󹮹,