Fig. 2 shows the outline plan and
elevation of a lean - to roof.
Surface A has a pitch of 30°,
surface B has a pitch of 40°
and surface C has a pitch of 45°.
(a) Draw the given plan and elevation of the roof.
(b) Develop the roof surface A.
(c) Find the dihedral angle between the surfaces B and C.
Scale 1 : 100