《甘肃省瓜州县第二中学七年级数学下册 4.3 探索三角形全等的条件课件2 （新版）北师大版》由会员分享，可在线阅读，更多相关《甘肃省瓜州县第二中学七年级数学下册 4.3 探索三角形全等的条件课件2 （新版）北师大版（19页珍藏版）》请在金锄头文库上搜索。
1、(), ,A,B,C,D,E,F,AB=DEAC=DFBC=EF ABCDEFSSS,1SSS,?,?,1,𣺽ASA AAS,2: 齻 A=600B=450AB=3cm,A,B,C,600,450,3cm,2ASA,(), ,3cm,(1) 3cm,?,(2) 3cm,?,3cm,.,AAS.,11,2B=EBC=EFC=F ABCDEFASA,3 B=E C=FAC=DF ABCDEF AAS,1AB=DE A =D ,B=E ABC DEF,2AB=DE ,A=D,C=F ABC DEF,ASA,AAS,1ACB=DFEBC=EFASAAAS -ABCD
2、EF,2BE=CD1=2AB=AC,A,B,C,D,E,F,B=EA=D,ABCDCB,ABCDCB ,ASA,A,B,C,D,O, ,2=1,AAS,34 21 CBBC,2ABCDEF,ABCDEF,ABC DEF ,SSS,AB=DE,BC=EF,AC=DF,ASA,A=D,AB=DE,B=DEF,AC=DF,ACB=F,AAS,B=DEF,BC=EF,ACB=F,BC=EF,: ,OAB = ? ,(),(),(), , ,(1) .,ASA.,(2) .,AAS.,:,3 ,(1) ? ., .,A,B,C,D,(),(),(),(2) , = ,AB=AC.,: (1),(3) AB=AC,(4) BD=CE,:,(2) AE=AD,(),(),(),(),(),(),A,B,C,D,E,1,2, CE12ABADABCADE, ABCADE 12 1DAC2DAC BACDAE ABCADC , ABCADE,AAS,D,C,B,A,1ABCAB=ACADBCBAD=CAD,ADBC BDCD壩 ABDACD, ABDACDSSS), BAD=CAB,ADBAC BDCD,ADBAC BADCAD壩 ABAC BADCAD ADAD ABDACDSAS BDCD,ABCDADBCAB=CDADBC,塢,
