180 degrees
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The internal angles add to 180 degrees.
the sum of the internal angles of a triangle, no matter whether isosceles, equilateral or scalene, is always 180 degrees
The 3 inside angles of any triangle add up to 180 degrees
The third angle is 85 degrees. The sum of all internal angles in a triangle is always 180 degrees
Sum of interior angles of a triangle total 180 degrees