Principes de la géométrie analytique. Géométrie de l'espace, par L. Painvin.

217

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/ /
4\ tn->L (y^"''-,-pZt) (Cf' yzl) + jz(ax+bytcz)+ Lsxyj+z =o;
eare Ic, olanr- nraycnJl ecard2n-z I Pat- de- c, le- c /e me a d zL. 7 dle, ce' nf e LT do'er-zt ccrjzre'cl q'.
/ t-. viaCicLaz e z Ecuat' ti); eI Ico tczlme ditL Jeconlz d1c'fe dotvernt- orc-at i/dfeZe- /-'
- p/'iS22S eR/l- v dJant r=o iL <ea- v- d2l-7 oltv.wc — lea Ct e Ox O.
cGl0,t pcOe, o/rL.oi rn.rrzir e>ikicr.r qLLe L -s ekon- la-l ol'tf/ec p.a.c /ieplz2- ar' Lt1z-r l p/u- c ej,;P, X/Y )+ + C3 (XY O) - 1. <-;.' '~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~eiTUon~~~~~~~~~~~~~~l