Circumference = 37.7 inches
Diameter = 12 inches
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Circumference of a circle = 2*pi*radius or pi*diameter
For the small circle of diameter 6, the circumference is 18.84.
The diameter of a circle with a circumference of 12 is: about 3.82To to this calculation for other circles, just divide the circumference by Pi (about 3.1416). The result is the diameter.
The circumference of the small circle would be 18.84.
Diameter of circle: 12/pi = 3.8197 meters to four decimal places