circumference = diameter × π
→ diameter = circumference ÷ π
Circumference of tyre = distance/rotations = 1320 ft / 180 = 7 1/3 ft
→ diameter = 7 1/3 ft ÷ π ≈ 2.33 ft
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Exactly 40 acres.
A mile is 5280 feet. 0.25 or 1/4 of mile is 1320 feet
One rod is 16.5 feet. Multiply that by 80, the answer is 1320.
Circumference is simply pi times the diameter. The approximate value of pi is 3.14, so for a circle 4 feet in diameter, the circumference is 4 x 3.14 = 12.56 feet, approximately.
The formula for the area of a circle is pi (3.141265...) times the radius squared. Since half of the diameter is the radius, plug that number into the formula to get the total square feet.