Exterior angles add up to 360 degrees
Interior angles add up to 1260 degrees
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1800 degrees (that is the sum of the internal angles of the 12-sided polygon).
The sum of the exterior angles of a polygon, however many sides it has, is 360 degrees. If the 20 sided polygon is regular, its angles are equal, and each is then 360/20 = 18 degrees.
2340 degrees would be in a 16 sided polygon.
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