The interior angles of a 13 sided polygon add up to 1980 degrees
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A 13 sided polygon interior angles add up to 1980 degrees
It will have (1980+360)/180 = 13 sides
It will have (1980+360)/180 = 13 sides
A 1980 sided polygon makes 1980 vertices.
There is no such figure as a 20 degrees polygon.