Answer by
Dogless (159)

There are 640 acres per square mile. 5280 feet per mile, squared, divided by 640 equals 43,560 square feet per acre. The square root of 43,560 is 208. 71 plus a hair. So an acre, if it's perfectly square, is 208 feet, 8. 5 inches (plus a hair) in length and width.