180*(40-2) = 180*38 = 6840 degrees.
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The interior angles of an 11 sided polygon add up to 1620 degrees
Any 7-sided polygon will do that for you.
It is a 15 sided polygon
The 3 interior angles of a 3 sided polygon which is a triangle add up to 180 degrees.
The interior angles of a 17 sided polygon add up to 2700 degrees