《数学人教版八年级上册“角边角”角角边》由会员分享，可在线阅读，更多相关《数学人教版八年级上册“角边角”角角边（33页珍藏版）》请在金锄头文库上搜索。
1、(ASA,AAS), 1. 2., , , ,𣺽ASA AAS,ABCA/B/C/A/B/=AB A/ =A B/ =B ()A/B/C/ABC,5,1A/B/AB,2 A/B/DA/ B/ =A EB/A/ =B A/ DB/EC/,C, ABC A/B/C/ A/B/AB A/ =A B/ =B ,A/B/C/,:, (ASA, AOC BOD: A=B, , 1=2, AOCBOD (ASA),AO=BO, (ASA,1,2,1.DABEACBECDOAB=ACB=C (1)AD=AE; (2)BD=CE, ADCAEB,A=A AC=AB C=B,ACDABEASA A
2、D=AE AB=AC BD=CE,1.,OABA= B AOCBOD?,2. BECFABDEABDEAD BE=CF,? ,?,(2),(1),C,B,E,A,D,(2) ,(2),6,ABCDEF,A D, BE, BCEF, ABCDEF,ABCDEF, A +B +C1800, D +E +F =1800, A D, BE, CF, BE, BCEF, CF, ABC DEF ASA,:,AAS,: ,OABC= D AOCBOD?,(),(),(), ,C= D,(AAS),:,1 (SSS),3 (ASA),4 (AAS),2 (SAS),1ACB=DFEBC=EFSAS,ASAA
3、AS - ABCDEF.,2BE=CD1=2AB=AC,AC=DFB=EA=D,AB=AC,1. ABABBFCDBC=CDBFDEA CE DEAB,ABCEDC, B=EDC=900 BCDC, 12, ABC DEF ASA ABED.,1,2,2.,ABBC, ADDC, 1=2. : AB=AD.,ABCADC, B=D, 12, ACAC, ABC ADC AAS ABAD., ABBC, ADDC, B=D=900, ,: B=DEF, BC=EF, :ABC DEF (1)SAS (2)ASA (3)SSS ;,ACB= DEF,AB=DE,AB=DEAC=DF,(4)AAS
4、,A= D,1 (SSS),3 (ASA),4 (AAS),2 (SAS),(1) ? ., .,(),(),(), ,(3) ACBDO,AC=BD,AB=CD. ,: (1)AD, ADCDAB,AD=DA AC=DB DC=AB,ADCDAB SSS C=B,(2) AOB DOC, B = C 1=2 DC=AB,DOCAOB AAS OA=OD ,1,2, ,-,2. AB ,3. AB=DEAF=CDEF=BCAD BFCE,4. AFDBECAEFC AD=CBAE=CFBD AC.,5. ABCBADBC = ADABCBAD .,6. AEF ABC E =B, EF=BC.AEF ABC.,7.ABC, ACB=90,AC=BC,MNC, ADMND, BE MNE,1MN(1),ADBEDE,(1),7.ABC, ACB=90,AC=BC,MNC, ADMND, BE MNE,2MN(2),AD,BE,DE,(2),7.ABC, ACB=90,AC=BC,MNC, ADMND, BE MNE,3MN(3),AD,BE,DE,(3),2010BFCEFB=CEAC=DF ABEDABED AB=EDBC=EFACB=DFE,
