Area

First, Customary measures.

1 square foot = a square that is 12 inches on a side.

1 square yard = 9 square feet

1 square yard = a square that is 3 feet or 36 inches on a side.

1 acre = 4840 square yards = 43560 square feet.

1 square acre = a square that is 208.7103256 feet on a side. or about 208 feet, 8 and 17/32 inches on a side.

1 square mile = 640 acres or 3097600 square yards or 27878400 square feet.

1 square mile = a square that is 5280 feet on a side.

1 square mile = a square that is 1760 yards on a side.

1 square foot = 144 square inches

This is a KLUDGE!

Now, look at the metric system!