It is: 360/180 = 2 degrees
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Providing that it's a regular polygon then each exterior angle will measure 12 degrees.
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It is a regular 10 sided decagon
For the 12-sided polygon, each exterior angle is 30 degrees (360/12).
If the 12-sided polygon is 'regular', then each of its exterior angles is 30 degrees. Whether the polygon is regular or not, all 12 of its exterior angles still add up to 360 degrees, but they may not all be equal.