The total interior angles add up to 1260 degrees.
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The interior angles of a 19 sided polygon add up to 3060 degrees
The interior angles of a 20 sided polygon add up to 3240 degrees
The interior angles of an 11 sided polygon add up to 1620 degrees
A 10 sided decagon polygon has 10 interior angles that add up to 1440 degrees.
The total of the interior angles of any n-sided polygon, regular or otherwise, is (2n - 4 right angles) or ((180 times n) minus 360) degrees.