180 Always. (on a flat surface).
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A triangle has three internal angles and three external angles, for a total of six angles.
The sum of the three angles of a triangle is always 180º
An isosceles triangle has two equal angles and one different angle. The sum of the angles in any triangle is always 180 degrees. Therefore, the two equal angles in an isosceles triangle must add up to 180 degrees minus the different angle. So, each of the two equal angles in an isosceles triangle measures (180 - x) / 2 degrees.
A right angle triangle has 2 acute angles that add up to 90 degrees, along with 1 right angle of 90 degrees.
If all of the interior angles of the polygon add up to 180 degrees, then the polygon is a triangle.