2 inches/3.1416 = 0.6366 inches
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Circumference = 2*pi*radius or diameter*pi
The circumference of a six-inch diameter circle is: 18.8 inches.
The circumference of a 6 inch diameter circle is: 18.8 inches. (diameter x Pi = circumference)
The circumference of a 4-inch diameter circle is: about 12.57 inches. (diameter x pi = circumference).
Please divide the circumference by pi, to get the diameter.