10090.5*10=50123456789101LLABLCD2abaAb//BbCbDb//b3,b,,ababaAbBbCb//D44A34B2C4D85.1111DCBAABCD,AC1111DCBA()A.B.C.D.6ABCD7233A30oB45oC60oD90o8A-BCD,AC=BD,EFGHABBCCDDAEFGHABCD9B1AC=A30oB45oC60oD75o10359()A.2B2C4D22.5*4=2011_________12//1L60o131111DCBAABCD,AA_____.14________________.33015101111DCBAABCD3,2,11CCBCAB1BA111DC21BCDDCC11AC1B1D1DCBA1610641710ABCACB=90oAC=BC=1PAABCPA=21BCPC2BPPACPBCA1055012345678910DDCCADCCCD452011.12.33213.414.;.3301511111DCBAABCD11//DCABBA111DCBAA123,1,311BAAABAA221CC1BCDDCC11CBC11BCDDCC112332arctan,33232tan11CBCCBC16P-ABCPPOABCABCOAOBCD,90POAAB=BC=CA=6,PA=43336)()(2222BCABAD3232ADAO,2)32(4)()(2222AOPAPOACEPEP-ABCACPE7342222AEPAPEP-ABC79762133PACSSDPBCAOEP-ABC362336213131=VPOSABC17.(1)PAABCABPAACPA,312222ACPAPC,211222BCACAB422222ABPAPB12BCPCB222PBBCPC,PCBBCPC(2)PCBCACBC,PACBCBPCBPPAC1PCBRt1,3BCPC3331tanPCBCBPC30tanBPC.