... Phngtrỡnhchớnhtccangthng Trongmtphngphcchongthng(d)iquaim Mo cútavz0 vcúvectch r u u phng ucútavu.Khiúphngtrỡnhchớnhtcca(d)l z=l z +d ,vi l = u u d = z0 - z (1.7) 1.2.2 Phngtrỡnhngthngquahaiim Trongmtphngphcchongthng(d)iquahaiimphõnbitM1,M2 ... NuMlgiaoimcaAA1 vBB1 ,thỡnúcútav B1A m= b + l1c + l1l2a iu nycúnghalimZvitavznmtrongonAA1.Tng 1+ l1 +l1l2 ttacngchngminhcZnmtrongonBB1.VyZtrựngvigiaoimMcav AA1vBB1. 1.2.4.Gúcgiahaingthng Giscúhaingthng(d1): ... + C =0(1.13) Ngcli,trongmtphngphcmiphngtrỡnh AA - C >0,vi z z + Az + Az + C =0 slphngtrỡnhcamtngtrũntõmIcútav z0 = -A ,bỏnkớnh R = AA -C 1.3.2 Mtsktquliờnquannbitoỏnngtrũn Trongthctcúnhiubitoỏnliờnquantingtrũn,khitachnhtavuụng...