A circumference is 4
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I assume that, by "Loonie", you mean the Canadian coin. Strictly speaking, it is not a polygon because its sides are not straight lines but if they were, it would be a regular hendecagon - an 11-sided regular polygon.
The circumference is the distance around a closed curve. Circumference is a special perimeter.
circumference = pi*diameter or pi = circumference/diameter
25.13 feet is the circumference. (diameter x pi = circumference).
The circumference is 12.56 approximately