square feet
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'Square feet' is a plural term for square foot. A square foot is unit of measurement. It used to measure areas. It is a non-SI (System De Interantionale) and a non-metric unit. It is known as United States customary unit or Imperial unit. A square foot is an area covered by a square.You use square feet for units when you calculate area.
the units for area are always stated as a square of some units of lengths?
No, volume is measured in cubic units, area is measured in square units.
If the area of a square is 35 square units the perimeter is: 23.66 units.
Square with side of 12 units => area = 12*12 sq units = 144 square units.