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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.
In one square mile, there are 640 acres. In one acre, there are 0.0015625 square miles. 21 people found this useful. 4 Jays. 1,270,696 Contributions. Facts, figures, conversions and physics are my interests on Answers.com.