geography
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Here is a few places where it can be used: Drawings , machinery, plans, planes, buildings, bridges, geometry problems, estimation, testing, space science, architecture, and engineering
plans d'étage
It could have just one - a plane (not plan!) parallel to its bases and halfway between them.
That can't be answered without seeing the details of your plans.
for residential wood framed construction, interior walls are typically 4-1/2 inches thick, exterior are 6-1/2.