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Area 36 ft diameter circle = pi x radius squared = 3.1416 x 18 ft x 18 ft = 1017.87 sq ft
8,758,257,663 sq ft
314.16 sq. ft.
(1248/pi) ft ^ (1/2) = 19.9 ft
If the diameter of the circle is 4 feet across the area is about 12.6 sq ft. You can check this by using the formula Area=Pi times the radius squared.