The question has no sensible answer, since the length depends on the shape of the area.
The most compact shape is a circle and one with a diameter of approx 5.53 miles would enclose an area of 24 square miles.
Suppose the shape were a rectangle. Pick any length, L, greater than 4.9 miles and let B = 24/L
Then the rectangle that is L*B will have an are of L*B = L*(24/L) = 24 sq miles.
Now L could be 5 miles, 50 miles, 5 quadrillion miles or more!
And the shape need not be a circle or rectangle. It could be any polygon or even some random shape.
If you want a straight answer you will have to ask a better structured question.
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A township = 36 sections = a square (6 miles by 6 miles). Perimeter = 24 miles.
27 miles by 14 miles = 378 square miles.
There are: 24*24 = 576 square feet
A four mile square is a square, each of whose sides is 4 miles long. Its area will be 4 miles * 4 miles = 16 square miles.
Answer: 1 m2 = 2.59 km2 5262 m2 = 13,628.5 km2 Answer: You can convert square miles to square kilometers, or miles to kilometers. But you can't convert square miles to kilometers.