Area of any circle = (pi) (Radius)2
Radius = 1/2 diameter
Area of this circle = (pi) (3.25)2 = 10.5625 pi = 33.183 square feet (rounded)
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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.
153.93804 square feet.
A circle with a diameter of 300 inches has an area of 490.87 square feet.
A 20-inch diameter circle contains: 314.16 square inches.