Remember the circle equation.
A = pi r^(2)
A = 3.141592.... (9ft)^2 =
A = 3.141592... 81sq.ft
A = 254.4690049... sq.ft. ~ 254.5 sq.ft.
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The area of a circle with radius r feet is pi*r*r square feet.
If the radius of a circle is 80 inches, then the area of the circle is 139.6263 square feet. (rounded)
About 1,963.49 square feet.
A circle with a radius of 75 feet has an area of 17671.458676442588 square feet. You calculate this by using the area of a circle formula, which is A=pi*r^2.
Area of the circle in square feet: pi*radius squared