You can't tell. There are an infinite number of shapes it could have, all with different dimensions.
Here are a few examples. They all have areas of 5 square miles:
Rectangles:
1 x 5 miles
2 x 2.5
3 x 1-2/3
4 x 1.25
10 x 0.5
2.2361 miles square
2.5231 miles diameter circle
100 square miles refers to the size of an area. You can't say 100 square miles = 200 regular miles, or anything like that. What you can say is 100 square miles is the area of a patch of land that is 10 miles long and 10 miles wide. Or 20 miles long and 5 miles wide. Or any two numbers that, when multiplied together, make 100.
5 acres = 0.0078125 square miles
One square mile = 640 acres, so 3200 acres = 5 square miles. So it could be a rectangle 5 miles by 1 mile. As long as it's a rectangle, any two lengths which multiply to 5 square miles (or 139,392,000 square feet) will work. So [1/2 mile by 10 miles] or [2.5 miles by 2 miles] would work as well, for example. But back in the old days, when the surveyors were sectioning out land. They would start with square miles (1 mile by 1 mile) then further divide those. So it could be 2 miles by 2 miles, with another 1 mile by 1 mile square next to that.
27 miles by 14 miles = 378 square miles.
1 square mile = 640 acres2 square miles = 1,280 acres..5 square miles = 3,200 acres5.2 square miles = 3,328 acres
5 square miles = 3,200 acres.
Long Island, New York, USA - 1,401 square miles land area.
The area of a circle with a circumference of 5 miles is approximately 1.26 square miles.
The radius is 1.261 miles.
424,163 square miles.
10 square miles
3/5*3/5 = 9/25 or 0.36 square miles
100 square miles refers to the size of an area. You can't say 100 square miles = 200 regular miles, or anything like that. What you can say is 100 square miles is the area of a patch of land that is 10 miles long and 10 miles wide. Or 20 miles long and 5 miles wide. Or any two numbers that, when multiplied together, make 100.
7,320 square miles.
The distance across an area measured in square miles would depend on the shape of the area. To find the distance across, you would need to know the shape's dimensions. For example, if the area is a square, you could find the distance across by finding the square root of the area. If it is a circle, you would need to calculate the diameter using the formula πr^2 = 85 square miles.
750 square miles
it is 4,580 square miles long