18/pi units = 5.73 units
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The diameter of a circle with a circumference of 18 is: 5.73
The formula for circumference is pi*d = circumference. Therefore just divide the circumference by pi to get diameter. Approx. answer = 5.73
18 x pi = 56.548
Circumference = pi*Diameter So D = C/pi = 40/pi = 12.732 inches (to 3 dp)
The circumference of 1.5 diameter is: 4.712