Not sure what you are asking. A 12 mile by 12 mile square would be 144 square miles.
12 square km is equal to 4.63323 square miles.
12 square miles = 7,680 acres.
144 square miles.
452.38896 square miles
334,540,800 square feet.
Over 12 miles.
Miles and square miles are units of different measurements. Miles are units of length and square miles are units of area. There is no answer to your question.
Answer: 12 mi² = 7,680 acres
A 12-mile line has an area of 0 square miles. A 12x12 mile square area has an area of 144 square miles, if that's what you meant. When you're talking about area, you need a length and a width.
None, a square mile is an area measure but a mile is a linear measure with no area.
You can't convert them. They are two different things. Miles is a measurement of distance, whereas square miles is a measurement of area. To get 12 square miles, there are different ways, like 3 miles by 4 miles, or 6 miles by 2 miles. 12 miles by 12 miles gives 144 square miles.