Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 219
the three points (3, — 2, 7),(6, 4, — 2), and (5, 2, 1) lie on a straight line. 8. If two of the direction angles of a segment are - and - , what is thethird ? ^ * 9. Show that the numbers 3, — 4, and — 2 are proportional to the di-rection cosines of the segment joining the origin to the point (3,… … Fig. 121 148. Projection of a segment upon any line. Let PiP^ be any segment, and AB any line in space. Through the extremities of the segment drawplanes perpendicu-lar to AB. Theseplanes determine asegment CD uponAB which is calledthe projection ofPiPo upon AB.Through P^ draw a line parallel to…
Geometry, Analytic
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