The area of a square measuring 0.5 mile (2,640 feet) on a side. Four quarter sections make up one section, which is equivalent to one square mile. One quarter section = 160 acres = 0.648 sq kilometers = 6.9 million sq feet
Interactive Learning Paradigms Incorporated ILPI (Knowledge at the Speed of Light), The MSDS Hyper Glossary (Home Page of the Material Safety Data Sheet Hyper Glossary), ILPI, NJ, USA 2011. http://www.ilpi.com/msds/ref/index.html, (MSDS - Amer) {448}