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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.
Report Abuse. 1  Acres Per Square Mile. 2  Acre To Mile. 3  there are 640 acres per square mile.  1 Acre = 0.0015625 Square 1  Miles. There are approximately 640 acres in a square mile.  1 square mile, =640 1  acre. Acres and miles can't be compared directly (because one measures area, while the other measures length). But if you mean, how many acres per SQUARE mile, the answer is: 640. Loading ... 640 acres per mile...it's called a section out here in the country.