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angle between line auxiliary plane auxiliary view axis Check algebraically co-point of line common perpendicular common point cone conical surface coordinates corresponding trace cylinder descriptive geometry determine the co-point determine the plane direction cosines direction numbers elevation Example find the angles front view given line given point given surface ground line H plane H projection H trace Hence horizontal plane horizontal projection intersecting lines isometric projection jection line segment method normal object observer octant orthogonal drawing orthogonal projection parallel lines PASS A PLANE picture plane plane figure plane of line plane parallel plane through point polyhedron problems projecting plane projections of point reference plane required line rotated shown in Fig skew lines solved tangent Tetrahedron third angle arrangement three planes tion top view trace of line triangle ABC true length true shape vein vertical projection vertical trace x-axis z-axis