If it is a square or rectangle, you multiply the length (in feet) by the width (in feet). If it is a circle, the formula is A=pi x r^2.
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Area is measured in square units of distance, such as square feet, square meters, square miles, square inches, etc.
cubic feet if a cube and square feet if a square shape
Area. Area is measured by two lengths multiplied together, so any square-shaped area would be measured in a square (length) area. For example houses could be measured in square feet, landscapes could be measured in square miles, something like a small surface might be measured in square centimeters.
Since acres are units of area, they are measured in square feet. An acre is equivalent to 43,560 square feet.
Square footage is an area - i.e a length (measured in feet) multiplied by a width (again, measured in feet). To measure square feet, measure the length, and width you require, then multiply them together. The resulting number is the "square footage".