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The sum of the interior angles of a four-sided polygon is 360 degrees.
The sum of the interior angles of a 12 sided polygon add up to 1800 degrees.
The sum of the interior angles of an n-sided polygon is 180n - 360 degrees.
the interior angle of a 7 sided regular polygon is 128.57 degrees
The sum of the interior angles of a 14 sided polygon are 2160 degrees.