If 15 cm is the diameter then circumference is pie x diameter which is 3.14 x15
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It is very easy math!
If a circle has a circumference of 16 cm then the radius is about: 2.546 cm
A circle with a radius of 81 cm has a circumference of 508.94 cm
Circumference=20.1 cm.
The diameter of a circle if the circumference is 41 cm is about 13.05 cm (C divided by Pi = diameter)