(SAS),SSS,A,B,C,D,E,F, ,ABC DEF, ABC DEFSSS,AB=DE BC=EF CA=FD,1,A,B,C,D,E, ABCADE, DEAB,A=A,B=ADE,C= AED,ABCADE,2.5cm3.5cm2.5cm40 ,2,ABC DEF AB=DE=3MBC=EF=5 M, B=E=300 ABC DEF ,ABC DEF AB=DE=3 M BC=EF=5 M B= E=300 ABC DEF ,2,ABCDEF,AB=DE B=E BC=EF,ABCDEFSAS,A,B,C,D,E,F,SAS,A,B,C,40,40,D,E,F,(1),D,C,A,B,(2),ABCEFD SAS,ADCCBA SAS, AB=CB ABD= CBD ABD CBD ,:, ABD CBD,AB=CB(),ABD= CBD(),A,B,C,D,1,: AD=CDBDADC,ABD= CBD AB=CB AD=CD BD ADC ,C, (2) :AD=CD BD ADC A= C ,1 ACBDOOA=OCOB=OD AOBCOD,2 AC=BDCAB= DBABC=AD,A,B,C,D,ABABAB,A,B,ABCACDAC=DCBCEBC=ECCDDEAB,AC=DC ACB=DCE BC=EC,ACBDCE,AB=DE,EDH=FDH, ED=FD EH=FH,EDHFDH SASEH=FH,:,2. ,1. , (SAS),3,