The circumference = 2 x r x pi
If your diamter is 81cm then your circumference is 254.5cm
If your radius is 81cm then your circumference is 508.9cm
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It has a circumference of 12.88 cm
Diameter in cm = circumference/pi
Circumference of the circle = pi*17.6 cm
Circumference of the circle = pi*17.6 cm
circumference = pi*46 cm