A diameter of 65 foot is 65 feet. Feet and foot are commonly interchangeable, but the meaning remains the same. So if I said I wanted a ten foot plank, I am also saying I want a plank of ten feet.
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A 48-inch diameter circle has an area of: 12.57 square feet.
Circumference = pi x diameter = 3.1415 x 12 = 37.698 feet
804.2496
A circle with a diameter of 9 feet has a perimeter of 28.3 feet.
30 * pi ≈ 94