Setting Drawing Units
Before you start drawing, it's important to decide what one drawing unit represents in the real world. Architects in the United States typically equate one drawing unit with one inch in AutoCAD. You need to choose a unit type that matches your country's industry standard.
Architectural As the name suggests, most architects will choose this type, which displays units in feet and inches. For example, 12 feet, 6½ inches is typed as 12′6–1/2″. The hyphen is used to separate inches from fractions of an inch rather than feet from inches.
Decimal Metric users should select this type. One decimal unit can be equal to one millimeter, one centimeter, or any metric unit.
Engineering Like the architectural type, engineering units feature ...
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