1800 degrees from 12 angels
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The sum of the interior angles of an n-sided polygon is (n-2)x180. For a dodecagon n=12, so the sum of the interior angles is: (12-2)x180o = 10 x 180 degrees = 1800 degrees
It depends on what the measures relate to: lengths of sides, interior angles, exterior angles, ...
The interior angle of a dodecagon is not 1260 that is of a nonagon * * * * * The interior angle of a dodecagon can have any value in the range (0, 360). The only restriction is that the sum of all 12 interior angles (which need not be equal) is 1800 degrees.
180*(12-2) = 180*10 = 1800 degrees.
The sum of interior angles of an n-sided polygon, regular or otherwise, is 2n - 4 right angles. Where n = 12 sum is ((2 x 12) - 4) x 90 = 1800 degrees.