Technical Drawing - Exam Papers - Ordinary - 1992 - Building

Question 4

Fig. 4 shows the outline plan of a hyperbolic paraboloid roof surface. The corners A and C are 40m above ground level and the corners B and D are 5m above ground level.

(a) Draw the plan of the roof and project the elevation.
(b) Draw an elevation of the roof in which the true length of the edge AD will be seen.
(c) Determine the true shape of the section R - R through the roof surface.

Scale 1: 500