3.14 x (r x r) 9 foot diameter circle
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A circle that has an area of 78.5 square feet has a diameter of 10 feet.
The area of a circle with a diameter of 8 feet is: 50.27 square feet.
A circle with a diameter of 6 feet has an area of 28.27 square feet.
A circle with a diameter of 18 feet has an area of 254.5 square feet.
A circle with a diameter of 24 feet has an area of 452 square feet.