Its interior angles add up to 1800 degrees
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12 exterior angles that add up to 360 degrees 12 interior angles that add up to 1800 degrees
where n = number of sides total sum of interior angles: (n - 2) * 180 so (12-2)*180 then divide that number by n 10*180 / 12
The interior angles of a 12 sided polygon add up to: (12-2)*180 = 1800 degrees
90 x ((2 x 12) - 4) degrees ie 1800o
The sum of the exterior angles of any polygon is 360 degrees. So for a regular dodecagon (12-gon), each exterior angle is 360/12 = 30 degrees. And so, each interior angle is 180 - 30 = 150 degrees.