The area of a circle is PI times the radius of the circle squared.
The radius of a one foot diameter circle it 1/2 or .5 feet.
.5 squared is .25 PI is 3.1416
3.1416 times .25 = .79 square feet
So, there are about .8 square feet in a 1 foot diameter circle.
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A circle with a 27-foot diameter has an area of 572.56 square feet.
153.93804 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.
379.94 square feet