The formula for circumference is pi*d = circumference. Therefore just divide the circumference by pi to get diameter. Approx. answer = 5.73
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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).
The diameter of a circle with a circumference of 18 is: 5.73
Circumference = pi*Diameter So D = C/pi = 40/pi = 12.732 inches (to 3 dp)