There is no such word as circunfrince. You have a tautological question so that the circumference of a 12 feet circumference circle is ... 12 feet!
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It is 3.8 feet, approx.
75 rounded
The circumference C is equal to [2 x pi x radius] or [pi x diameter]In the example, the circumference is 12 pi = 12 x 3.1416 = about 38 feet (37.70 feet)
The circumference of a 12-foot-diameter circle is 37.7 feet.
C = 2πrC = 2π * 6C = 12π or 37.6991 feet.