You see how many triangles fit into the shape and multiply by 180 degrees
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The sum of the interior angles of a 14 sided polygon are 2160 degrees.
the interior angle of a 7 sided regular polygon is 128.57 degrees
3240
The sum is 540 degrees, each angle being 108 degrees.In general, in an n-sided polygon, the sum of the angles is 180 (n-2).
540 degree for the interior angles