Descriptive geometry . cular to V. E is a point and E^ is perpendicular to GrL. LinejPis perpendicular to H, and line ^is perpen-dicular to P, K^ and K being perpendicularto VP and HP^ respectively, and K^ being apoint. 11. A line lying in either coordinate planeis its own projection on that plane, and itsother projection is in the ground line. InFigs. 20 and 21, line A lies in H and line Blies in V. 12. A line parallel to one coordinate planeand oblique to the other has its projection onthe plane to which it is parallel equal to thetrue length of the line in space, and the anglewhich this pro
Descriptive geometry . cular to V. E is a point and E^ is perpendicular to GrL. LinejPis perpendicular to H, and line ^is perpen-dicular to P, K^ and K being perpendicularto VP and HP^ respectively, and K^ being apoint. 11. A line lying in either coordinate planeis its own projection on that plane, and itsother projection is in the ground line. InFigs. 20 and 21, line A lies in H and line Blies in V. 12. A line parallel to one coordinate planeand oblique to the other has its projection onthe plane to which it is parallel equal to thetrue length of the line in space, and the anglewhich this projection makes with tlie groundline is the true size of the angle which the linemakes with the plane to which it is A, Figs. 16 and 17, is seen in its truelength in its vertical projection, and it makesan angle of 30° with H. 13. If two lines are parallel in space, theirprojections will be parallel. Figs. 22 and Cand D are parallel; therefore C^ andD are parallel, and 0^ and D^ are parallel. LINES. Fig. 14 Fig. 15. Fig. I
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