11 ft diameter gives area = 95.03 sq feet (to 2 dp)
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There are about 38.48 square feet in a 7' diameter circle
A 45-foot diameter circle has an area of 1,590.4 square feet.
The diameter is 4.222 feet.
1256.64 square feet
Area of a circle is PI times the square of the radius (half the diameter). 3.1415 x (7.5 squared) = about 176.7 square feet