Technical Drawing - Exam Papers - Higher - 1992 - Building

Question 2

Fig. 2 shows the plan and elevation of a pitched roof containing a dormer window. The surfaces B and C have a pitch of 40° and the dihedral angle between the surfaces A and B is 130°.
The true shape of each of the dormer surfaces D and E is an equilateral triangle. Draw the given plan and elevation and find the dihedral angle between the surfaces B and E.

Scale 1:100.