Interior angles: 1620 degrees
Exterior angles: 360 degrees
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The interior angles of an 11 sided polygon add up to 1620 degrees
It doesn't matter what shape it is, the sum of the exterior angels in any polygon is 180.
That's the definition of "supplementary angels".
The sum of all the interior angles of any trapezoid is 360 degrees.
The sum of the interior angles of an n-gon is (n-2)*180.