How long is 100 square miles?

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There is no sensible answer to this question. A square mile is a

measure of area, with dimensions [L2]. Basic dimensional analysis

teaches that you cannot convert a square length to a length without

additional information.

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100 square miles = 1 mile * 100 miles

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or 1 yard * 176000 miles

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or 1 foot * 528000 miles

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or 1 inch * 6336000 miles.

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You could get much greater lengths if you had smaller widths. In

fact any length of 10 miles or more is possible.