360/12 = 30 degrees
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Interior Angle: 150 degrees (Interior Angle Sum: 1800) Exterior Angle: 30 degrees (Exterior Angle Sum: 360)
Each exterior angle = 360/12 = 30 degrees. Each interior angle = 180 - 30 =150 degrees.
150
360/12 = 30 degrees
Sum of exterior angles of an n-gon is 360 degrees. A dodecagon has 12 exterior angles which are all equal and so each is 360/12 = 30 degrees.