The area of a 27 feet diameter circle: pi*13.5^2 = 573 square feet rounded
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Area of a circle = pi*radius2 Area = pi*13.52 = 572.5552611 or 573 square feet to the nearest square foot.
pi*27 feet
The circumference of a 27-foot diameter circle is about 84.82 feet. (diameter x Pi = circumference).
Area = 3.976 square feet
If 27 inches is the diameter, then that is the diameter. If 27 inches refers to the radius, you must multiply it by 2 to get the diameter.