Depending on what "a circle of 480 feet" means, the radius will have different values.
If the radius is 480 feet, then that is your answer.
If the diameter is 480 feet, then its radius is 480/2 = 240 feet.
If the circumference is 480 feet, then its radius is 480/2(pi) = 240/(pi) = 76.39 feet.
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A circle with a radius of 14 feet has an area of 615.75 square feet.
The radius of a circle, if its circumference is 420 feet, is 66.8 feet.
The area of a circle with a radius of 3 feet is: 28.27 square feet.
A circle with a radius of 6.8 feet has an area of 145.27 square feet.
A circle with a radius of 14 feet has a circumference of 87.96 feet.