Elements of Descriptive Geometry

30 degrees 3RD ANGLE 45 degrees A-B and C-D a₁ Aa₁ allel Analysis axis base c₁ circle cone Construction cube cutting plane cylinder Descriptive Geometry Determine the projections determine the true develop the surface Dihedral Angles Draw the projections edge equal Exercise front G₁-L₁ given angle given plane given point H and 11 H see Fig hence horizontal piercing point horizontal trace inch isometric projection line A-B line in space line of intersection parallel to G-L parallel to H pass a plane pendicular perpendicular to G-L perpendicular to H Perspective pierce H plan and elevation plane of projection plane perpendicular plate point in space prism PROBLEM pyramid radius represent required angle required plane revolution rotation ruled projector shown in Fig space projector swing tangent third angle plan tion triangle true distance true length V₁ vertical and horizontal vertical piercing point vertical plane vertical projection wire