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If 15 cm is the diameter then circumference is pie x diameter which is 3.14 x15
The diameter of a circle if the circumference is 41 cm is about 13.05 cm (C divided by Pi = diameter)
A circle with a radius of 81 cm has a circumference of 508.94 cm
If the circumference of a circle is 45 cm the length of the diameter in centimeters is: about 14.32 cm
circumference = π x diameter ⇒ diameter = circumference ÷ π = 12 cm ÷ π ~= 3.8 cm