Object lines are drawn:

• Dark and continuous

• Light and dashed

• Thin and spaced

• Bold and dotted

Hidden lines are used to show:

• Features not visible in that view

• Inclined planes

• Projection alignment

• Fold lines between views

Construction lines should be:

• Light and used for alignment

• Heavy and solid

• Erased before measuring

• Used only for shading

A centerline is used to:

• Indicate symmetry or rotation

• Outline visible edges

• Connect projection planes

• Divide sections for color coding

The main purpose of orthographic projection is to:

• Represent a 3D object accurately on 2D planes

• Show perspective depth

• Add shading and realism

• Emphasize surface texture

In a multiview drawing, the front view shows:

• Width and height

• Height and depth

• Width and depth

• Depth and diagonal

The top view in a multiview layout is drawn:

• Directly above the front view

• Below the front view

• To the left of the front view

• Opposite the right-side view

The side view in a third-angle projection is placed:

• On the same side as the object

• Opposite to the front view

• Below the top view

• In the upper-left corner

In orthographic projection, the projection planes are:

• Perpendicular to each other

• Parallel to the object

• Tilted at 45 degrees

• Overlapping for equal scaling

The glass box method helps drafters:

• Visualize how 3D views unfold onto 2D planes

• Align object lines to grid paper

• Rotate drawings for perspective

• Add shading to features