A normal surface is perpendicular to a plane of projection.

Usually screws, bolts, shafts, tubes, and other elongated parts are drawn in a vertical position in the front view.

If an angle is in an inclined plane, it may be projected either larger or smaller than the true angle depending on its position.

Width is shown in the rear, top, front, and bottom views.

The rear, left-side, front, and right-side views align horizontally.