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1、,12.2 () ASAAAS, 1ASAAAS 2ASAAAS ,1.,2. ?,SSS,SAS,飬,(1),(2),1,1,2,3, ,ABCDEF EF=BC E = B F = C,1EF=BC,2MEF = B;NFE= C EMFND.,D,E,F,M,N,3,ABCDEF, ABCDEFASA,A= D,B = E,AB=DE,(ASA,ABE ACD , ABE ACDASA AE =AD,1 D ABE ACBA =AC B =CAD =AE, ABCDEFA=D B=E BC=EFABCDEF ,2, ABC=180o DEF=180o, C=F, A=D B=E,ABCD
2、EF,B=E,C=F,BC=EF, ABCDEF ASA, ,ASA,ABCDEF, ABCDEF AAS,(AAS,1.DABEACBECDOAB=ACB=C BD=CE,O,AB=ACAD=AE,BDCE,2 , ACBDO , : 1. _ = _. 2.BAO DOC _ . 3., .,_ _ _ _,_ _ _ _,_ _ _ _,A,B,D,C,O,AOB COD,2,OA=OC AOB=COD OB=OD SAS,AOB=COD OB=OD B =D ASA,AOB=COD OA=OC A =C ASA,*,*,AOB=COD A =C OB=OD AAS,AOB=COD A
3、=C AB=CD AAS,3, ,ABC ACB90o ,CD AB,D,ACDCBD,A= 1 ADC= CDB=90o CD=CD,ACDCBD,ASAAAS,2.1=23=4 AC=AD,3=4 , D=C ?,AO=BO,11=23=4BD=CE AB=AC,2ABCDADBCAB=CDADBC,1.ABABBFCDBC=CDBFDEA CEDEAB,21=2 3=4 BD=CD,1. :EABCDCD FCBEAAF DE=BF,2. CDABDBEACEBECDOAOBACOB=OC,1 2 棿,ABBD,EDBD,BDBCDCBDAB=DE,ABCEDC,ACB = ECD,BC
4、 = DC,B = D, ABCEDCASA,AB = DE,1ABDEBCDCBDAB=DE,ABCEDC,ACB = ECD,BC = DC,B = D, ABCEDCASA,AB = DE,ABDE B=D,2ABDEBFCDBF=CDAB=DE,A,B,D, DAB =EAC DAC =EAB. AEBEADDC D =E =90. ADC AEB ,2 AEBEADDCCD =BEDAB =EACAB =AC, ADC AEBAAS AC =AB,2 AEBEADDCCD =BEDAB =EACAB =AC, EF ACADCBAE = CFB =DDF =BE, ADCB A =C. AE =CF AF =CE. ADF CBE , EF ACADCBAE = CFB =DDF =BE, ADF CBEAAS DF =BE, B =DDFBE ,
