,11.2.2,ABABAB,A,B,SSS,1, ABCADE DEABA=AB=ADEC= AEDABCADE,ABC,AB=3cmAC=4cm,2. AMAB= 3cm,3. ANAC=4cm,A=45ABC,1. MAN= 45,4.BC,ABC,2,ABC DEF AB=DE=3 M B= E=300 BC=EF=5 M ABC DEF ,ABC DEF AB=DE=3 M B= E=300 BC=EF=5 M ABC DEF ,2,ABCDEF,AB=DE B=E BC=EF,ABCDEFSAS,SAS,40,D,E,F,(1),(2),ABCEFD SAS,ADCCBA SAS, AB=CB ABD= CBD ABD CBD ,:, ABD CBD,AB=CB(),ABD= CBD(),A,B,C,D,1,: AD=CDBDADC, AB=CB ABD= CBD AD=CD BD ADC ,A,B,C,D, (2) :AD=CD BD ADC A= C , 1 ACBDOOA=OCOB=ODAOBCOD,2 AC=BDCAB= DBABC=AD,ABABAB,A,B,ABCACDAC=DCBCEBC=ECCDDEAB,AC=DC ACB=DCE BC=EC,ACBDCE,AB=DE,EDH=FDH, ED=FD EH=FH,EDHFDH SASEH=FH,2.5cm3.5cm2.5cm40 ,A,B,C,D,E,F,2.5cm,3.5cm,40,40,3.5cm,2.5cm,2,ABCABDAB=ABAC=AD B=B,:,2. ,1. , (SAS),3,A.12 ,B. P90 56,C.P90 89,