CHAPTER 7. ANALYTIC GEOMETRY===== =
=
Figure 130.
=
kçêã~ä=cçêã=
ñÅçëα+óÅçëβ+òÅçëγ−é=MI==
ïÜÉêÉ==é==áë==íÜÉ==éÉêéÉåÇáÅìä~ê==Çáëí~åÅÉ==Ñêçã==íÜÉ=çêáÖáå=íç=
íÜÉ=éä~åÉ=I=~åÇ=ÅçëαI=ÅçëβI=Åçëγ=~êÉ=íÜÉ=ÇáêÉÅíáçå=ÅçëáåÉë=
çÑ=~åó=äáåÉ=åçêã~ä=íç=íÜÉ=éä~åÉK==