《数学人教版八年级上册sss判定三角形全等.2.5边边边((sss)》由会员分享,可在线阅读,更多相关《数学人教版八年级上册sss判定三角形全等.2.5边边边((sss)(15页珍藏版)》请在金锄头文库上搜索。
1、13.2.4 ,?,2.:SASASA; :AAS.,1.;,1AC=DBACB=DBCABC ABC= AB= 2ADBAC ABDACD (1)SAS (2)ASA (3)AAS ,DCB,SAS,DCB,DC,AB=AC,BDA=CDA,B=C,?,ABC,A=50,B=60, C=70.,50,50,60,60,A,B,C,A,B,C,A?,B?,C?,70,70,abc,4 cm,a,3 cm,b,4.5 cm,c,裺,1.AB c(4.5 cm).,2.A,b(3cm);B,a(4cm);C.,3.ACBC.,a,b,c,A,B,C,ABC.,ABCDEF,:,AB=DE BC=E
2、F CA=FD ABCDEF(SSS),.S.S.S.,ABCD,AB=CD,AD=CB,ABC CDA.,:ABC CDA, AB=CD(), BC=DA(), AC=CA(), ABC CDA(S.S.S.),D,D,A,B,C,(1) B=D ;,(4),(2) ABCD ,(3) ADBC ;,ABCD,AB=CD,AD=CB,ABC CDA., (S.A.S.), (A.S.A.), (A.A.S.), (S.S.S.),?,?,AB=DCAC=DB. :ABCDCB.,: (1)ABODCO (2)OBOC?,ACBDOAB=DCAC=BD 1 A=D 2 OB=OC,A,B,C,D,O,飺,ABCAB=ACEFABACAE=AFBFCEO,ABFACESAS,EBCFCBSSS,EBOFCOAAS, 1= 2 ABC DCB_,1,2,ABC=DCB(ASA),A=D(AAS),AC=DB(SAS),鱻,?,A,B,C,19.2 1.4,:,