The interior angles of a dodecagon sum to 1800 degrees.
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The 12 interior angles of a dodecagon add up to 1800 degrees
A dodecagon is a 12 sided shape that has 12 interior angles that add up to 1800 degrees and 12 exterior angles that add up to 360 degrees
A dodecagon has twelve vertices.
The exterior angles of a 12 sided dodecagon add up to 360 degrees
The sum of the interior angles of a dodecagon (not duo-decagon) is (12 - 2)*180 = 1800 degrees.