| A | B |
|---|
| Box | Formed by six prependicular planes of projection |
| Third Angle Projection | This is the standard in the United States |
| First Angle Projection | Used by many other countries around the world |
| Views | Must be aligned |
| Front View | most descriptive view |
| Two Views | Simple objects can be described |
| Balanced | Within the working space |
| Height | distance from the bottom to the top |
| Width | distance from one side to the other side |
| Depth | distance from the front of the object to the back |
| Top view | shows the width and depth |
| Front view | shows the width and the height |
| Side view | shows the depth and the height |
| Visible Line | Edges that can be seen |
| Hidden Lines | Edges that cannot be seen |
| Centerlines | show the center of arcs and circles or the axis of symmetrical objects |
| a point | Edges that are perpendicular to a plane of projection |
| true length lines | Edges that are parallel to a plane of projection |
| foreshortened lines | Edges that are inclined to a plane of projection |
| Normal Surface | Parallel to a plane of projection appear as true size surfaces |
| Inclined Surface | A surface that appears "foreshortend" to a plane of projection. |
| Oblique Surface | Appear as “foreshortened” surfaces on all planes. |
