18.8496 cm. Just multiply your diameter by pi.
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circumference = π x diameter = 6π cm ≈ 6 x 3.142 cm ≈ 18.85 cm
The circumference of a circle if the if the radius is 6 cm is: 37.7 cm
The circumference of a circle with a diameter of 6 feet is about 18.85 feet.
The best estimate for the circumference of a circle that has a diameter of 6 is 18.9
The circumference of a 6 foot diameter circle is: 18.8 feet. (C = d x Pi)