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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.
Best Answer: There are 640 acres to a square mile. So an acre is ((5280)^2 / 640 square feet. That comes out to 43,560 square feet to an acre. When we take the square root of 43,560 we will know the length of one side of the acre. That is ~ 208.710 feet. Four times that will be the perimeter.