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If you mean that all the interior angles add up to 1620 degrees then it will have 11 sides.
Since it has 11 sides, the sum of the interior angles is 180 degrees ( 11-2)= 180(9) or 1620 degrees.
Exterior angles: 360 degrees Interior angles: 1620 degrees
Interior angles: 1620 degrees Exterior angles: 360 degrees
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