Square Miles
A measurement of area equal to one mile length by one mile width making an area of 640 acres
ft² =
mi² * 27878000
Square Feet
The square foot is a unit of area used in the imperial and U.S. customary measurement systems.
A square measurement is the two-dimensional derivative of a linear measure, so a square foot is defined as the area of a square with sides 1 ft in length.
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