If an edge is perpendicular to a plane of projection, it appears as a point.

More Questions from Orthographic Projection

• The depth dimensions in the top and side views do not necessarily correspond.
• If an angle is in an inclined plane, it may be projected either larger or smaller than the true angle depending on its position.
• A plane surface always projects either on edge or as a surface in any view.
• Any principal view shows three of the four principal dimensions.
• First-angle projection is primarily used in Europe and Asia.
• The rear, left-side, front, and right-side views align horizontally.
• A total of three principal views are arranged in a standard way.
• Drawings are two-dimensional representations of objects that allow you to record sizes and shapes precisely.
• Height is shown in the left-side, top, right-side, and bottom views.
• A normal surface is perpendicular to a plane of projection.

Discussion & Comments