4. If technical drawings are used to communicate size and shape descriptions, it is not important to worry about either the weight of a line or the type of line being used.
9. The primary difference between isometric drawings and perspective drawings is that in an isometric drawing both vertical and horizontal lines remain parallel while in a perspective drawing both horizontal and vertical lines are in line with an apparent vanishing point.
10. The center line of a hidden cylinder feature appearing in the front view should line up with the center mark in the corresponding circle which appears in the auxiliary view.