Well a space is defined by one or more dimensions . There are an unlimited amount of dimensions. According to this, you could represent a space with any of these units mentioned, depending on how many dimensions make up the space.
For example, if we are describing a scenario where we are tiling a floor (area), we would use a squared unit (square feet), as the floor has two dimensions (length and width).
An alternative scenario would be the amount of space inside of a box (volume). In this case we have three dimensions, which include length, width, height. As such, a cubed unit would be used (cubed feet).
A space that is represented with one dimension could be seen as a distance. As an example, the distance between the tv and the couch. In this case a simple unit is used (just feet).
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cubic feet if a cube and square feet if a square shape
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".
Area is measured in square units of distance, such as square feet, square meters, square miles, square inches, etc.
Since acres are units of area, they are measured in square feet. An acre is equivalent to 43,560 square feet.
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.