,3 3, , SSS ASA AAS,1 2.5cm3.5cm40?黭, SAS.,2.5cm3.5cm2.5cm40,(2),.,.,ABCEFD (SAS),ADCCBA (SAS),.ED=FD EDH=FDH, EH=FH, EFG EH=FI=GJ,EHJ, FIH, GJI HIJ, EHJFIHGJI HIJ,E=F=G EF=FG=GE EH=FI=GJ EFEH=FGFI=GEGJ FH=GI=EJ EHJFIHGJI (SAS) JH=HI=IJ HIJ,AB=DE, BC=EF, AC=DF; AB=DE , B=E, BC=EF; B=E, BC=EF, C=F; A=D, B=E, AB=DF; AB=DE, AC=DF, B=E. ABCDEF ( ).,A. 2 B. 3 C. 4 D. 5,B,2. ABAC ABEACD( ).,B=C B. AEB=ADC C. AE=AD D. BE=DC,3. AOB AOB( ).,A,A. SAS B. SSS C. ASA D. AAS,D,B,4. CEBF ACDF, AC=DF, CE=FB, ABCDEF 𣿲., ACDF C=F CE=FB CE+EB=FB+EB CB=FE AC=DF ABCDEF (SAS),ABDECD,BDECDA,ABCECB,ABEECA,1AD5,1. ,SAS,2. ,SSSSASASAAAS,3., 4.8 1,