- published: 02 Feb 2016
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The square mile (abbreviated as sq mi and sometimes as mi2) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. It should not be confused with miles square, which refers to the number of miles on each side squared. For instance, 20 miles square (20 × 20 miles) is equal to 400 square miles; an area of 10 × 40 miles is likewise 400 square miles, but it is not 20 miles square.
One square mile is equal to:
A square mile is equivalent to the following metric measures:
When applied to a portion of the earth's surface, which is curved rather than flat, "square mile" is an informal synonym for section.
Romans derived measurements from marching. Five feet was equal to one pace (which is appropriately a double step). 1,000 paces measured a Roman mile, which was somewhat smaller than the English statute mile. This Roman system was adopted, with local variations, throughout Europe as the Roman Empire spread.
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