"square foot" is singular, "square feet" is plural. In other words, if you are referring to one 12" by 12" area, (144 inches or less), square foot is appropriate. However any dimension greater than 12" by 12", (that is, 144 total inches once the multiplication is complete), square feetis the nomenclature which is germane.
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A linear foot is distance. A square foot is area. One square foot is the area of some square tiles used on floors. Ten square feet is 1 foot x 10 feet or 2 feet x 5 feet. Don't confuse this with a 10 foot square which is 10 feet by 10 feet which equals 100 square feet.
144 square feet
64 square feet
1 square-foot.
851.568 square feet to the nearest square foot is 852.