When viewing a plan or elevation view, a true length is a Frontal plane your line of vision.
In a multi-view projection, the object is displayed perpendicular to its major faces, so each view shows only one face of the object. The front projection plane is the plane onto which the front view of a multi-view drawing is projected.
Basically, a plan is a bird's eye view of a space. When drawing a floor plan, remove the roof to expose the interior. This is a side view. An elevation is a side view of an object. When drawing interior elevations, this represents one of the walls.
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