It is an 11 sided polygon whose interior angles add up to 1620 degrees
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The sum is: (11-2)*180 = 1620 degrees
An interior angle is the inside angle of a shape e.g quadrilateral, square
Since it has 11 sides, the sum of the interior angles is 180 degrees ( 11-2)= 180(9) or 1620 degrees.
The sum of the interior angles is 180(11-2)=1620 now since there are 11 of these each interior angle has measure 1620/11 or 147.273 degrees
The interior angles of any shape besides a triangle will add up to 360 degrees.