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The circumference of a 128-foot diameter circle is: 402.12 feet.
diameter = 128/pi
It is a simple Algebra question. The answer is 401.92.
128 divided by pi (approx. 3.1415927) = about 40.743 feet.
128=2πr 128/2π=r r=20.37 Diameter is equal to twice radius Therefore 20.37 times 2 40.74