Assuming the shape is a regular dodecagon, the formula for calculating the perimeter for a dodecagon of side length n is equal to 12n.
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The perimeter of a dodecagon is the sum of the lengths of its 12 sides. These sides may be of different lengths.
The formula is 1/2 (apothem) (perimeter)
L2 + H2 = P
The boundary or perimeter of a circle is called the circumference. The formula for calculating the length of the circumference is C = 2πr.
The perimeter of a circle is called its circumference. The formula for calculating the circumference is: C = πd (pi x diameter).In this case, this would be 8 in. x 3.14... or about 25.13 inches.