... coincidencethisvalueofAm+B/*+Czmustbeindeterminate,andthereforeA/+B^D=o )(58)Am+B+C=ofaretheconditions ofcoincidence.NOTE.This last methodis ageneralone ofdeterminingthe ... theprojectionsofPP,PP", etc.,or,theprojectionofanyoneside of aclosedpolygonallineonastraightlineisequalto thesumoftheprojectionsof the other sides on that line.10. USEFULPARTICULARCASE.Theprojectionofth? ... coordinatesOM,MN,NPof thepointP.ForOMNPisaclosedbrokenline,andtheprojectionofthesideOP onastraightlinemust beequaltothesum oftheprojectionsofthesidesOM, MN,andNPon thatline.NOTESONSOLID...