The page provides the formula to calculate perimeter of dodecagon (12 sided polygon). It is a two-dimensional geometric shape with 12 sides and 12 angles. A 12 sided polygon object will have the same length and have the interior angles of the same measurement. The perimeter of the object can be calculated by knowing the length of any one side. Refer the dodecagon perimeter formula below to know how to calculate the perimeter of 12 sided polygon based on the side length.