32.8084 ft
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If the circumference is 128 feet, the radius is 20.37 feet. If the diameter is 128 feet, the radius is 64 feet.
A circle with a radius of 10 feet has an area of 314.16 square feet.
A circle with a radius of 9 feet has an area of 254.47 square feet.
If the diameter is 5 feet then the radius is 2.5 feet. If the circumference is 5 feet then the radius is 0.79577 feet.
4 feet. The radius is half the diameter.