The interior angles of an octagon add up to 1080 degrees
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The sum of the interior angles of a 12 sided polygon add up to 1800 degrees.
Any polygon can have two interior angles of 12 degrees. No polygon can have all its interior angles of 12 degrees.
The interior angles of an 11 sided polygon add up to 1620 degrees
There is no such polygon whose interior angles add up to 250 degrees.
A 19 sided polygon has interior angles that add up to 3060 degrees.