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THE PIERCING POINT OF A LINE WITH A PLANE
THE PROXIMITY OF THE OBSERVER TO OBJECTS
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ahbh assume a plane auxiliary plane auxiliary projection auxiliary view axis base bisector cone connect construct a plane contain the line contain the point curve cylinder descriptive geometry drawing edge of H element figure find the T-L front view frustum given plane horizontal and vertical horizontal plane infinite number intersecting lines line of intersection line of vision line parallel locate method object parallel to H pendicular perpendicular to H pierces Q piercing point plane A-B plane Q plane slopes plane tangent plane to contain planes of projection profile plane radius required plane required to construct required to find respectively revolve the line revolved position shortest distance shown in Fig side view sloped surface solution sphere study Fig study of Fig surface of revolution tion top view traces triangle abc true angle true length V-projection V-trace vertical plane visualize the fact