Divide the diameter by 2 to get the radius. Then use the standard formula for the area of the circle (which is pi times radius squared).
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13.6354 square feet (rounded)
Area of circle: pi*2.75 squared = 23.758 square feet to three decimal places
There are 100*pi square inches in a 20 inch diameter circle
19.63 square inches are in the area of a 5-inch diameter circle.
The area of a 3-inch diameter circle is about 7.068 square inches.