The sum of the interior angles of a convex n-gon is (n-2) straight angles or
in degrees (n-2) times 180.
Example ; hexagon n= 6, n-2 is 4 , so the total is 4 straight angles of 720 degrees.
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A quadrilateral is the only polygon whose interior angles add up to 360 degrees.
A 10 sided polygon which is a decagon and its interior angles add up to 1440 degrees.
The interior angles of an 11 sided polygon add up to 1620 degrees
The interior angles add up to 5940 degrees
The interior angles add up to 1800 degrees