Unit 5 Multiview Drawings 79 Copyright Goodheart-Willcox Co., Inc. planar, surfaces are oriented in space and how the orientation of these planes changes how surfaces and edges appear in multiview drawings. For now, three principal projection planes will be estab- lished, and only the three regular views will be considered. The front view will project onto a plane called the frontal plane, the top view will project onto a plane called the horizontal plane, and the right side view will project onto a plane called the profile plane. See Figure 5-9. With these three projection planes in mind, the following principles may be helpful: • Principle One. A flat surface is oriented perpendicular, parallel, or inclined to a projection plane, Figure 5-10. Goodheart-Willcox Publisher Figure 5-9. Three basic projection planes are used to explain multiview drawings. Frontal P r o fil e Horizontal F r o n ta l H F F P H P Goodheart-Willcox Publisher Figure 5-10. A flat surface can be oriented perpendicular, parallel, or inclined to a plane of projection. Perpendicular Parallel Inclined