The sum of the three INTERIOR angles is 180 degrees. And a 3-sided polygon is often referred to as a 'Triangle'.
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180 degrees.
The 3 interior angles of a 3 sided polygon which is a triangle add up to 180 degrees.
An obtuse triangle.
the sum of the interior angles of a 3 sided polygon is = 180 degrees. the sum of the interior angles of any polygon is given by 540/n. in this case n is = 3
It can be an obtuse triangle.