History lesson of the day: The term acre came from the amount of land that could be plowed in a day by an ox pulling a wooden plow. Which is a row one furlong long (660') by 4 rods wide (16.5') Which equals 43,560 sq. ft. (One acre = 43,560 sf) There is no was I could plow my 5 acres with an ox in 5 days. Maybe if I were born 200 years ago. So, according to the graphic, I own 1/3 of an oxgang of land.