2020中考专题4——几何模型之隐圆问题

[]120204.:1233.ADACABADBACB2ADBACBBACBDC1801.ABACADCBD2BDCBAC44CAD.1232.ABCD2ABcm3BCcm2cmEFEFP2cm3.CDABOCDABMCDCCPABPAB8PM4.AB1050P1APB30P2PyAPB30P3PyAPBP[]21.1ABCD2AB3ADEFADDC2EFGEFPBCPAPG122.2ABCD4AB6ADEABFBCEBFEFEBFBDBD3.A(3,0)ByC2ACtanBOCmm4.3RtABC90C6AC8BCFAC2CFEBCCEFEFCPPAB.3455.4ABCD//DCAB1BC2ABACADBD.6.5ABCDABACADBAC25CAD75BDCDBC.7.AB.6ABCDECDA.CB.DEC.DED.CD6788.7ABOPQOPQABRPQPSABQTABSTSTSRT60PQAB.9.8PAPBAPB2ACBACPBDPB4PD3ADDC.[]310.A40B60CyBCA45C.11.9RtABCC90AC3BC4DABEBCBCDADEAD.91012.10B2m.BAByBCxACPABPABOPC45m.13.ABCAB4BC5ACB45ABCBABC111-1C1CACC1A1211-2AA1CC1.ABA14CBC1311-3EABPACABCBPP1EP111-111-211-3[]414.y83x234xxABAByC.1AB2lE40MlABMl15.y34xxyBAPOBABCOCP90Pm0m[]5202041.ABACADBCDAABCAD2CBDBAC2BDCCBD2BDCBAC44CAD2BAC88882PB1EFPABCD1cm422901646()360cm63.COMOCPOCMO90CMOPCOEPMPMEPMPMPMCO4PMPMmax441ABABCCACCyP1P2AP1BP1APBACB6030APB30P2PyCCGABG1A10B50OA1OB5AB4CCGABAGBGAB2OGOA+AG3ABCACBCAB4CG2C32CCDyDCP21C32CD3OD2P1P2CyAP1BAP2B30CP2CA4CD3DP2[]6CCDP1P2P1DP2DP202P102+PyP302P402+P0202+0202+3ABEyPAPBAPBAEHAPBAEHsinAEHAEPEAEHyAPBPyEAEHxH2EyPPEOPEHABOPOHEPOPOHEHO90OPEHOPEHPEOH3EA3EHA90AH2EA3EHOPP0PyP0PyyMPMAMBENNA2ANBAMNANBAMBAPBANBAPBAMBPyAPBAMBPyAPBP001.2EFGEF1DGGD1ABCAADBCPD1GPAPGAG2AB3AD4AA5AD514AGADDGPAPG442.BEEADBEBD[]7EBFEBFEBBFEBEBEAB4AB2AEEB6AD2262210DE2102BD3.CA2OCACBOC2AC3OA5OC90BOAACO90BOCAOC90CAOAOCBOCOAC5tantan2OCBOCOACACCBOCCCx90BOC5tan2BOC52m4.//PEABRtABC90C6AC8BC226810AB2PFFC90FPEC//PEAB90PDBFDFPPDAAACBADFAFDABCAFDFABBC4108DF3.2DF3.221.2PDDFFP5.AABBAAFDF//DCABDFBC1DFCB224BF[]8FBA90FDB2215BDBFDF6.ABACADADBABDACBABCADCACDBAC25CAD75ACB18025277.5DABDAC+CAB100ADCACD18075252.5ADB180100240BDCADCADB52.54012.5DCBDCA+ACB52.5+77.5130DBC180DCBBDC18013012.537.5BDC12.5DBC37.57.BCACBDADAEBEABDEADBAEBDEDEC8.OPOQORRPQORPQOPOQPORQORPSABPSOPRO90PSOROPPSRPORQTRQORPSRQTRRSTRTSSRT60RSTRST60RTS60RPORSO60RQORTO60OPQPQOPAB2PQ9.PAPBAPB2ACBABCPPBADDCPB+PD(PB-PD)=710.BAEA40B60AB10E10[]911EEPBAEPAB5PBABPA90PAPBPPAPBPyCBCAPBCABPA45CPPFyFOFPE5PF1RtPFCPF1PCCF7OCOF+CF5+712C0122231yC012C01201201201211.RtABCC90AC3BC4AB5DADD1DBCDEBCADxDEADxBDABAD5xBEDC90BBDEBACx2DBCBCADABADAD[]1012.3xOKCOKCOCKEABEOC2OKKCEKKCKKCABmBC1+ABPOPCOKC45BKABPOPCOKC45mBC2m2m1+2m1+13.1A1C1BACB45BCBC1CC1BC1CB45CC1A1CC1B+A1C1B45+45902ABCA1BC1BABA1BCBC1ABCA1BC1ABC+ABC1A1BC1+ABC1ABA1CBC1ABA1CBC1SABA14SCBC131BBDACDABCDACRtBCDBDBCsin45PACBPACABCBPP1ABEP1EP1BP1BEBDBE2PACCABCBPP1ABEP1EP1BC+BE2+57[]1114.1y00x14x22ABA40B202yx1D1SACBAB?OC9RtAOCAC5ACDAChAC?h9h1ACACh2l1l2x1Dl1yECCFl1FCFhCEACykx+bA40C03ACyx+3l1ACCEl1yx+3xD11D11ACl2D21DD11D2132ABFFEF2FMMMNxN[]12A40B20F10FFMFB3E40FE5RtMEFME4sinMFEcosMFERtFMNMNMF?sinMFE3FNMF?cosMFE3ONMlME40lykx+blyx+3yx3lyx+3yx315.y=0BCCDxDCaOD=aPD=m-aOCDCPDmmPOBOCABPBmm.m3m