The angle between two planes is called:
a. Complementary angles
b. Supplementary angles
c. Dihedral angles
d. Right angles
e. Obtuse angles
Question 2
Projection lines are:
a. Parallel to the inclined surface
b. Parallel to the primary view
c. Perpendicular to the reference plane
d. Perpendicular to the top view
e. Inclined to the finished auxiliary view