18.85 inches.
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The circumference of a 6-inch circle is: 18.85 inches.
circumference = 2πr = 2π x 6 = 12π units
The circumference of a circle with a diameter of 6 feet is about 18.85 feet.
The circumference of a circle if the if the radius is 6 cm is: 37.7 cm
The best estimate for the circumference of a circle that has a diameter of 6 is 18.9