The circumference of 15 is: 47.12
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A circumference of 47.1'
The diameter of a circle with a circumference of 15 centimeters is about 4.775 cm
Circumference of the circle: 15 times pi = 47.1238898 meters
A radius (not raduis) of 15 units implies a circumference of 94 units.
circumference = 15*pi cm