A decagon is a 2-dimensional shape bounded by 12 straight sides. In a regular dodecagon all the sides are equal and all the angles are equal.
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A dodecagon is a 12 sided polygon which can be regular or irregular and its interior angles add up to 1800 degrees
Each interior angle of a regular 12 sided dodecagon measures 150 degrees
A regular dodecagon has six pairs of parallel lines.
Assuming the shape is a regular dodecagon, the formula for calculating the perimeter for a dodecagon of side length n is equal to 12n.
The sum of the interior angles of a dodecagon is:sum = (12 - 2) x 180o= 1800oIn a regular dodecagon, each of the interior angles is 1800o ÷ 12 = 150o