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éêëìÆO\n´íQCDîï.\r(2)(3?)0@2,ÛAABC=>?DE\n¼`AEXF%BCZ5E½\nNApNl\rN2]\rð±ñOò0ó±ñOò\nQ/Ap/I\rN2]
t0óƱñOò\n´-u.\r^_(1)JKN&'bAEADô/XEAD,\rõ<NEAD=/EAT>,ZAED=ZA,ED,ZADE=ZA(DEt\r)t/AED=x,/ADE=y,\rt./AEA\n=2x,NADA\n=2y,\r.,.ZI=180°-2x,Z2=180°-2yt\rNA=-(Z1+Z2)t\r2\rVZ1=180°-2x,Z2=180°-2y,\r11\r...x=90--Zl,y=90--Z2,\r22\r.,.ZA=180°-x-y=190-(90--Zl)-(90--Z2)=-(Z1+Z2).\r222\r(2)JK:LADEAADE?DE(g,\r.1.NA\n=NA,\rö7.7/AEA'=180°-/2,Z3=ZA,+Z1,\r.*.ZA+ZAEA'+Z3=180°,\r3NA+18O°-N2+NA'+N1=18O°,\r-(\n2NA=/2-NL\r_1_\r.1.NA=2(/2-/I).(1)N÷ø4(AADEôLADEtN÷ø4(/\rAEA'=2x,/ADA'=2y,)`$,4(Nl=180°-2x,Z2=180°-2ytùúu/l=180°-2x,2=180°-2y,\r4(x=90-2Zl,y=90-2Z2,)#$%*$+,-4(NA=18(T-x-y,)cd!
æP4(/\rA=2(Z1+Z2)t(2)&'+#$%*$+,-J^34.