How is the square footage of a building calculated?

The calculation of square footage is based on the area of a two-dimensional space, specifically a building’s floor. To determine the square footage, you multiply the length of the building by its width. This formula, Length x Width, provides the area in square units, allowing you to understand how much floor space is available within the building.

The other options propose different methods that do not yield the correct result for square footage. For instance, height is irrelevant in calculating area since square footage pertains only to the length and width of a flat surface. Perimeter and height would relate more to volume than area, further leading to confusion when discussing square footage. Adding length and width does not account for the full area a building covers, thereby providing an incorrect measure of square footage. Thus, Length x Width is clearly the correct approach for this calculation.