How many acres do you need to run a 1 mile strip across your land?

If we assume that the "strip" is only 1 foot wide the answer would be:

There are 5,280 feet in a mile, if the "mile long strip" is 1 foot wide, that strip would comprise 5,280 square feet (5280 x 1).

Each acre comprises 43,560 square feet therefore the strip would make up .1212 acres (5280 sqft/43,560 sqft).

If the "mile long strip" was 10 feet wide, multiply .1212 acres x 10 to determine that the strip would comprise 1.212 acres. Simply multiply the width of the strip by .1212 to determine the acreage of the strip.