The profile plane is the plane upon which the side view is projected.

More Questions from Orthographic Projection

• A plane surface that is parallel to a plane of projection appears on edge as a straight line.
• Usually screws, bolts, shafts, tubes, and other elongated parts are drawn in a vertical position in the front view.
• If an edge is perpendicular to a plane of projection, it appears as a point.
• 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.

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