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The formula for finding an apothem is s = 1/2 aP. S is the area, a is the apothem, and P is the perimeter.
The perimeter of a hexagon with an apothem of 12 is 83.14
Perimeter = 2*Area/Apothem.
An apothem is a line segment from the center of a regular polygon to the midpoint of a side.