The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).
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The circumference of a 128-foot diameter circle is: 402.12 feet.
The circumference of a six-foot diameter circle is: 18.85 feet.
It is 12.6 ft, approx.
The answer depends on whether the 4 foot measure is the radius or the circumference.
You should clarify whether "1-foot circle" refers to a circle with a radius of 1 foot, a diameter of 1 foot, or a circumference of 1 foot. The circumference of a circle is equal to the diameter times pi (approximately 3.14).