Interior Angle: 150 degrees
(Interior Angle Sum: 1800)
Exterior Angle: 30 degrees
(Exterior Angle Sum: 360)
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150
360/12 = 30 degrees
The measure of each interior angle of a dodecagon, which is a 12 sided regular polygon, is 150o. This is found in any polygon by multiplying 2 less than the number of sides by 180o and then dividing the product by the number of sides. A dodecagon interior angle is then 10 x 180o/12 = 150o.
Each exterior angle = 360/12 = 30 degrees. Each interior angle = 180 - 30 =150 degrees.
Each interior angle is 150 degrees