(27/3.14-.5d)2 x 3.14
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If you mean a circle then its square footage formula is: pi*radius2
Area of a circle = pi*radius2 Area = pi*13.52 = 572.5552611 or 573 square feet to the nearest square foot.
The area of a 27 feet diameter circle: pi*13.5^2 = 573 square feet rounded
pi*27 feet
The circumference of a 27-foot diameter circle is about 84.82 feet. (diameter x Pi = circumference).