24 feet - you answered your own question !
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74.4 ft2
If the diameter of the circle is 24 feet, the radius is half that, or 12 feet. If the circumference of the circle is 24 feet, the radius is 24 divided by 2 divided by pi, or 3.82 feet.
The square foot area of a 41-foot diameter circle is: 1,320 square feet.
The area of a circle with a 7-foot diameter is: 38.48 square feet.
The formula for the area (A) of a circle is A = π r2 - where r is the radius. The diameter (d) of a circle is twice the radius. The area of circle having a diameter of 24 ft is A = π 122 = 144π = 452.39 sq ft (2dp)