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THE POINT AND THE STRAIGHT LINE
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additional plane auxiliary planes axes axis of projection axis of revolution axonometric projection centre coincidence conical surface construct the projections coordinates corresponding curvature curved line cylinder cylindrical surface determine diameter dihedral angle dimetric projection directrices distortion factors drawn elements ellipse equal find the point generatrix given in Fig given plane H plane helix horizontal line horizontal projecting plane horizontal trace hyperbola hyperboloid instance isometric projection line of intersection line of recall line segment located major axis minor axis oblique plane obtained parabola parallel projection perpendicular plane containing plane curve plane of projection plane parallel plane perpendicular plane Q plane specified point of intersection points belonging prism profile plane profile projection pyramid QUESTIONS TO SECS revolved ruled surfaces secant plane shown in Fig skew lines space curve sphere surface of revolution tangent line tion torus trace Ph triangle ABC vertex vertical line vertical projecting plane vertical trace x-axis