The area of a circle with a 13 ft diameter is: 132.7 square feet.
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Diameter of circle: 13/pi = 4.138 ft to 3 decimal places
Circumference = (pi) x (diameter) = 13 pi = 40.84 ft(rounded)
40.8407045
Area = 415.48 ft2
The area is 56.745 feet2