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1、Welcome,12.2 (2), ,SSS,ABC DEF, ABC DEFSSS,1,AB=CDAC=DB :A=D,SSS,𣿼.,(2) ,(1) ,(3) ,(4) ,:,SSS,!,?,?, , A,ABAC, ,ABCABC AB=ABA=ACA=CAABCABC , , 1 DAE =A 2AD AB=AB AEAC=AC 3BC,:,2,ABCDEF,ABCDEFSAS,(SAS),F,E,D,C,B,A, ,SAS,İ 飨 ,ABABCACDCD =CABC ECE =CBEDDEAB,ABC DEC , ABC DECSAS AB =DE ,SSA,SASS
2、SA,ABC DEFB =E=30 AB =DE=5 cm AC =DF =3 cm, ABC DEF ,ABC ABD AB =ABAC = ADB =BABC ABD ,SSA,A,B,D,A,B,C,SSA,SAS), ,SSS, SAS,.AC=BDCAB= DBA BC=AD,:ABCBAD,AC=BD CAB=DBA AB=BA,ABCBADSAS,(),(),(),BC=AD (,C,1. ,AOBDOC,AO=DO() _=_( ) BO=CO() AOBDOC , AOB, DOC,SAS,2.AB=ACABD ACD?,3EFBCBE=CFAB=DC B=C. A=D,4AB=AE,AC=AD,BAD=EAC, B=E,5.:ADBC,AE=CF,AD=BC,E.,1 2SAS 3,
