125.6 acres. A mile is 5,280 ft. Divide by 4= 1320. 1320 x 1320 x 3.14 (pi) gives you the number of square feet in that circle. Divide that by 43,560 (number of sq ft in one acre) and you get 125.6.
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To calculate the number of acres in a 1-mile radius, we first need to find the area of a circle with a radius of 1 mile. The formula to calculate the area of a circle is A = πr^2, where r is the radius. So, the area of a circle with a 1-mile radius would be A = π(1)^2 = π square miles. To convert this area to acres, we need to know that 1 acre is equal to 43,560 square feet. Since there are 640 acres in a square mile, the number of acres in a 1-mile radius circle would be approximately 640π acres.
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 640, since there are 640 acres in 1 square mile.
There are 640 acres in 1 square mile. So (1/2 mile)*(1/4 mile) = 1/8 square mile, or:(1/8 square mile)*(640 acre/square mile) = 80 acres
1 square mile = 640 acres.Area of a circle = (pi) (radius)2Area = (pi) (0.5)2 = 0.25 pi = 0.7854 square mile = 502.655 acres. (rounded)
You can't convert between units of area and units of length.