The circumference of a 55 centimeter ball is: 172.8 cm(c = d x Pi)
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If that's the diameter, you can multiply that by pi (which is approximately 3.14), to get the circumference.
Circumference of a circle = 2*pi*radius or diameter*pi
Circumference is Pi x d so it is 55 Pi which is roughly 172.7 cm
Circumference of pool ball: 2*pi = 6.283 inches rounded to 3 decimal places
dia. of a 50 gal drum = 23". circumference = dia. X pi (22/7). circumference is slightly more than 72".