The area is 314.159 square feet.
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Area of a circle in square feet = pi*radius2
circumference = π x diameter => diameter = circumference ÷ π ~= 20ft ÷ 3.14 ~= 6.37 ft
The area of a circle with a diameter of 9.4 m is: 69.4 m2
Double the value of the radius which in this case is 2*20 = 40 feet
If the area of a circle is 8pi, its diameter is: 5.657 units.