Circumference = pi*Diameter
So
D = C/pi = 40/pi = 12.732 inches (to 3 dp)
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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).
Please divide the circumference by pi, to get the diameter.
The circumference of a 10-inch diameter circle is: 31.4 inches.