Pens vary considerably in size so there is no simple answer.
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you measure the length of AA pencil or a pen in cm
1 foot 6 inches would be a better estimate.
The perimeter (measured in feet) could be any one of the lengths in the following set:P = {28, 32, 38, 52, 98}
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precision engineerting, e.g. piston ring size in car engines.