Verified Answer :

alex3245

The sum of the interior angles of a polygon is:

180(n-2)

Where n is the number of sides. Therefore

180(1)
=180

So the interior angles add up to 180 degrees in a triangle.

AL2006

The sum of the three angles inside a 3-sided polygon...
commonly referred to as a "triangle" ... is 180 degrees. 

It doesn't matter whether the polygon is regular or not. 
Any three sides make three angles that total 180 degrees.

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