Dodecagon refers to a shape that has 12 sides and 12 angles. In other terms, it is called as 12 sided polygon. In reality, coins from different countries such as England, Australia, Croatia, and Canada appears in the shape of the dodecagon. A regular dodecagon has sides of the same length and internal angles of the same size. To compute outer boundary or distance around the 12 sided polygon, use the below online perimeter of dodecagon calculator.
Calculate perimeter of a dodecagon with side length of 9 mm.
P = 12 × 9
= 108 mm