180
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180 degrees.
The sum of the three INTERIOR angles is 180 degrees. And a 3-sided polygon is often referred to as a 'Triangle'.
The 3 interior angles of a 3 sided polygon which is a triangle add up to 180 degrees.
A triangle is a 3 sided polygon that has 3 interior angles that add up to 180 degrees.
An 3 sided equilateral triangle has 3 interior angles each measuring 60 degrees