A 3-sided polygon is called a "triangle".
The angles of a triangle don't equal 180 degrees.
They total 180 degrees when they're added.
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A 10 sided polygon which is a decagon and its interior angles add up to 1440 degrees.
A three-sided polygon is a triangle. The angles in a triangle add up to 180 degrees.
The sum of the exterior angles of a polygon, however many sides it has, is 360 degrees. If the 20 sided polygon is regular, its angles are equal, and each is then 360/20 = 18 degrees.
Exterior angles add up to 360 degrees Interior angles add up to 1260 degrees
The interior angles of a 17 sided polygon add up to 2700 degrees