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A circular area of 5 miles radius covers 50265.5 acres (to 1 dp) Area = pi*radius2, which with radius in miles will give you area as 78.53982 square miles, then multiply by 64 â¦ 0, since there are 640 acres in 1 square mile.
Determine how many acres you are converting to square miles. This number will probably already be given to you, but you can also use an area calculator map to determine the acreage of a real-world tract of land. For example, you might want to convert 2,500 acres to square miles. 3. Multiply the number of acres by 0.0015625{\displaystyle 0.0015625}. This decimal is a way of representing the ratio of square miles to acres, or 1640{\displaystyle {\frac {1}{640}}}, since, for every 1 square mile you have, you have 640 acres.