出典:Wikipedia
出典:『Wikipedia』 (2011/06/12 17:49 UTC 版)
The square foot (Sq Ft) is an imperial unit / U.S. customary unit (non-SI non-metric) of area, used mainly in the United States, Canada, United Kingdom, Hong Kong,Bangladesh, India, Pakistan and Afghanistan. It is defined as the area of a square with sides of 1 foot (0.333... yards, 12 inches, or 0.3048 metres) in length. For comparison, the average new one-family house in the United States in 2007 had a total floor area of approximately 2500 square feet.