.CDCDAB2..3.().(1)AOB=CODAB=CD(2)AB=CDAOB=COD4:12()34()5.()12341ACB=21AOB2ABACB=903ACB=90AB4CD=AD=BDABCRt5:.ABCDCDE=ABCC+A=1806:.1234.1OCOCABAB2OCABOCAB37:.PAPBPA=PBPOAPO=BPO8:ABCDOABCDEOACBCADBD==AE=BEABCDEFOABCOPABOABCDEABCOABCD=ABCDACBDABCOABO123.1BDBCCBD=CAB2EDBCCBA=DEF9:12.1PAPB=PCPD2ABPCABPC2=PAPB10:12.1PCPBPC2=PAPB2PBPDPAPB=PCPD11:12.121O1O2O1O2AB212O1AO212:1nRNrnannn2RtAOC.(1)n=n360(2)n1802nB.1.2.3nn2n.ABCDABCDEFABCPABCDPABO1O2AO1O2nnABCDEOarnnnRABCDPABCPOEFAB=1.1C=2R2L=180Rn3S=R2.4S=LR21360Rn25S=SAOBAOB.2.1S=2rh(r:h:)2S=LR21.L=2rRr1.2.3.4drdrd=rdr.5dRrRrdR+rd=R+rR-rdR+rd=R-rdR-r.6.7OCAB.OABCRt.OABC.OAB.OBCADP.OACDBP.ODCPAB.OACDPB.M01ANO2.01CNO2DEABM.NAM02O1.CBMNADEO102.CEADBOAC=DB.ACBO102.BACOPPAPB.OABCDE.OPABC,.OBCEADP,.OABCP,.BACDEF.FEDBACOGH.ABOCDADBCOAOBAOB=180AOB.EACBOD,.EFCDBAORtABCr=2cba.O.ABCo1o2AB=2221)rR(OO.CABo1o2AB=2221)rR(OO.ACDPOBPCPARt.BCDOAPO.DEMABCFNGANBC:ANAMBCGF.