the wall
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If you are sitting in a room, the ceiling and the floor are parallel to each other. The walls are perpendicular to the floor and to the ceiling. So any line on these surfaces will be parallel to or perpendicular to any line on the other surface. And if they were not, the building could be quite unstable.
The foot of a perpendicular is the lowest part of the perpendicular [Kinda like the feet of people]||||_____^ This is the point where the foot of the perpendicular meets the line.
FAR=Total floor area of building / Total lot area
2 inches of floor
Square footage of a building usually refers to the total square footage of floor area.