Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 219
int of the last is the initialpoint of the first, constitutes a closed line, or polygon, in space.The sum of the projections of the sides of a closed line upon anyline in space is clearly equal to zero. It follows from the fore-going property that: Theorem. The sum of the i^Tojections of a series… … closed line, and hence the sum of the projections of its sides upon any line is equal to zero; i.e. the sum of the projections of Pj^ ^22 the sides of the broken line joining J. to B is equal to the projection of the straight line joining A to B. Arts. 148-151] PERPENDICULAR SEGMENTS 203 150. The…
Geometry, Analytic
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