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106 ^lt 3 aJ 7t6t-+E pl ar P= g (a) (b) reJ 3-12 ulol{7llHJ+(gr-EF+ "! =-Er.+) trEHoll el-Lf ^lcel utr4 oJ'J [rB 3-12)q (b)e] rJ"l fldes+rl c"J# Egzl 9L-l. gdql^.1 zldql , -ll A +de-l tsJd}olfl(direction cosine)ol (a, b)gl zldg ,JA4g ax+by-c:0 -o s e I g+. ol "tlel *6"tq €g +. B d EleJ zl xf 4 ol+- zl"l H 3-12) E (b)ql !_ ql HIe+ +ol zl d el +9 B d ulEl(unit normal vector)e_r. *= 6 4tr +9 E d ElEl E x€ E(a)4 vC EG)9 [_z a : cos 0, b: sind 7l flt;l. ^l (3-l)ql^]- x7l 64EfzI qq yE xel ql+ 1;|rl o g -E^lEl-rll "le} z! ol y: (x)9 €4 _ a E^l€ 49 Hl ollzl]Efg *.J+4(explicit equation)olzll + =+. "JeI+ € 4(explicit form)tr- e E g {dg "J HI4 11;1 *alC ol fr_L zldtlg 6J dg +6148 +qd x61.il 46J v#g Zlta}€ol 6Jtr1.4 (3_3)g zldel Hd ulrl9 oJ6J( 0)+ gdqlrl*rJ 4]tlzl4 z-l 4(c)ql E6iq zldE eg6}r 9l= r.ll ol ^lel 6lHg x,yql ++ lz}^l "Jg g + gltrl. ol e+ zJol s(x, y) : 09 € Ell= ,*= 4 g ul u]] zll E+g +++4 (implicit equation) ol ell B==ril, *.Jf€4s ee-lg zlde zldtlE 6J dg zl e6IElE "J-J+ €utl-+ E}+qzl"t ++. S++€4_a {Eg zldg s(x, y):0r+ -q(x, y):0E F zlzl _E€ol 6.J+ 7IE6Jr]l "l= ol-$aNr.l zldql o}6}cg +q+ + gl+.el= E-tr [rH 3-t2)E (b)e] Eol zldel g+ H]vJEql^.1= s(x, y)>Ool g_r s=+ a=cos 0 b=sin 0 (3 -3) (3-4)