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Technical Drawing  Exam Papers  Higher  1996  BuildingQuestion 2Fig. 2 shows the outline plan and elevation of a roof and a dormer window. The surface B has a pitch of 30° and the surface A has a pitch of 40°. The line of intersection between the surfaces B and C has a true length of 19m. The dihedral angle between the surfaces B and C is 145°. The true angle between the horizontal surface E and the sloping dormer surfaces D and F is 120°. (a) Draw the given plan and elevation. (b) Determine the dihedral angle between the surfaces A and B. Scale 1: 200 


