If your town decides that a foot is only 10 inches, then there becomes a problem with trading with other towns. Standards do away with this problem.
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Standard International unit (SI unit)
Usually to measure mass, one uses grams or kilograms.
Answer: Acre, Meter, Kilometer, etc. Answer: You need some square unit. The standard SI unit for area is square meter, but you can also use hectars (= 10,000 square meters) or square kilometers.
The same unit as you use to measure any mass. The SI unit for mass is the kilogram.
This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.