How long is 100 square miles?

Answer 1

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.

100 square miles = 1 mile * 100 miles

or 1 yard * 176000 miles

or 1 foot * 528000 miles

or 1 inch * 6336000 miles.

You could get much greater lengths if you had smaller widths. In fact any length of 10 miles or more is possible.