《13.2.5 边边边zhang》由会员分享，可在线阅读，更多相关《13.2.5 边边边zhang（46页珍藏版）》请在金锄头文库上搜索。
1、5.,13.2,1AC=DBACB=DBCABC ABC= AB= 2ADBAC ABDACD S.A.S. A.S.A. A.A.S. ,DCB,S.A.S.,DCB,DC,AB=AC,BDA=CDA,B=C,S.A.S. () A.S.A. () A.A.S.(),ABC,A=50,B=60, C=70.,50,50,60,60,A,B,C,A,B,C,A?,B?,C?,70,70, , , ABCABCABABACACBCBC, ABCABCABABACACBCBC, ABCABCABABACACBCBC, ABCABCABABACACBCBC,A,1BCBC 2BCBACAA 3ABA
2、CABC,ABCABCABCABC.,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., ,.,19,S.S.S.,ABC DEF, AB=DE() BC=EF() AC=DF() ABC ADC(S.S.S.),3,ABCD,AB=CD,AD=CB,ABC ADC.,:ABC CDA, AB=CD() CB =AD () AC=CA() ABCADC(S.S.S.),ABCDAD=BC AB=CD,D,D,A,B,C,(1) B=D ,(2) ABCD ,(
3、3) ADBC,2:.AB = AD ,BC = DC :B= D,A,B,C,D,AC ABCADC,AB=AD(), BC =DC (), AC=AC(),ABCADC(S.S.S.), B=D (),ABCAB=ACADBCBDA= , ADBC BD=CD ABDACD, BDA+CDA=1800 BDA=CDA =180O2=900,90,AB=AC(), BD =BC (), AD=AD(),ABDACD(S.S.S.), BDA= CDA ,CFADAF=DCAB=DEBC=EF ?A= ?D,AB=DE(), BC =EF (), AC=DF(),ABCDEF(S.S.S.),
4、ABCDEF, AF=DC AF-CF=DC-CF AC=DF, A= D ,1AB=DCAC=DBABCDCB,ABCDCB ABCDCB,AB=DC(), AC =DB (), BC=CB(),ABCDCB(S.S.S.), (S.A.S.), (A.S.A.), (A.A.S.), (S.S.S.),P72,AB=ADCB=CDEACBE=DE, ABCADC,AB=AD() CB =CD () AC=AC (),ABCADC(S.S.S.), BAC=DAC (),ABEADE,AB=AD() BAE=DAE() AE=AE (),ABEADE (S.A.S.), BAC=DAC ()
5、, BE=DE ( ),ACBDOAB=DC,AC=BD 1 A=D 2 OB=OC,BC ABCDCB,AB=DC(), AC =DB (), BC=CB(),ABCDCB(S.S.S.), A=D (),ACBDOAB=DC,AC=BD 2 OB=OC, AOBDOC,AOB=DOC() A=D() AB=DC(),AOBDOC(A.A.S.), OB=OC(),P 73 2 1,B,AB=ACAD=AEBD=CE_, ,飺,ABCAB=ACEFABACAE=AFBFCEO,1,ABFACES.A.S.,EBCFCBS.S.S.,EBOFCOA.A.S.,2,3, ACB= DBC ABC DCB_,1AB=CDAD=BC ,2AD BACAB=ACBDCDACABFE ,
