pi*18 cm
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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
The circumference is about 56.548 cmUse this formula for future calculations: diameter x 3.1416 (Pi) = circumference
circumference = π x diameter ⇒ diameter = circumference ÷ π = 12 cm ÷ π ~= 3.8 cm