Technical Drawing - Exam Papers - Higher - 1997 - Paper 1
Fig. 5 shows the plan and elevation of a regular tetrahedron of 90mm side. The tetrahedron has been cut by an oblique plane as shown.
The true length of the edge DF is 57mm and the cut surface DEF is inclined at 40° to the horizontal plane.
(a) Draw the given plan and elevation.
(b) On a separate diagram, draw a plan and elevation of the complete tetrahedron when the corner C rests on the horizontal plane and the corners A and B are 20mm and 60mm,
respectively, above the horizontal plane.