40 mm is 40 mm, a little over 1 1/2".
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16000mm cubed or 16 cm cubed
The radius would be 6 cm because the diameter is 2 times bigger than the radius.
circumference = π d (pi x diameter)= 1256.6 feet
If you mean a circumference of 56.55 meteres then its diameter is 56.55/pi = 18 meters
32"