The 11 interior angles add up to 1620 degrees
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The interior angles of an 11 sided polygon add up to 1620 degrees
An interior angle is any angle on the interior of the triangle.
It is: 180-exterior angle = interior angle
the interior angle is about 128.571428 the exterior angle is about 51.4285
No. It forms the angle and so is neither in the interior nor the exterior.