Circumference of circle = Pi X D (3.1416 X Diameter of 6) = 18.8496 18and 1/2 inches 3.14 is constant,
thus,
6x3.14=18.84
18.84 is the answer.
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If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).
Since circumference equals pi times the diameter, if the diameter of a circle is 6, then its circumference is going to be pi times 6 or 6 pi.
The circumference of a 6 foot diameter circle is: 18.8 feet. (C = d x Pi)
The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
The circumference of a 6 cm diameter circle is: about 18.85 cm. You can easily do this calculation for other circles by multiplying the diameter by Pi (about 3.1416).