250 square miles.
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1 square mile = 640 acres, so 1 acre = 1/640 sq.mile, and 10 acre = 10/640 sq mile or 1/64 square mile [0.015625 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.
Well, honey, to calculate the area in square miles, you multiply the length by the width in miles. So if you have a rectangle that is 10 miles long and 5 miles wide, you just do 10 x 5 to get 50 square miles. It's as simple as that, darling.
You cannot have an area of 120 ft. An area must be measured in square units, such as square feet. The answer will be different if the area is 120 ft by 1 ft wide or 10 ft wide or 10 miles wide!
A mile is not a measure of an area so, as asked, the question has no answer. Unfortunately, 150 km squared is ambiguous since it could refer to an area of 150 square kilometres (say 10 km by 15 km) OR an area of the square with sides of 150 km. 150 square km = 57.92 square miles 150 km square = 22500 square km = 8687.3 sq miles = 93.21 miles square.