Because it has to or else it wouldn't be a triangle, just a random polygon, or other geometric shape.
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Yes they do add up to 180.
The 3 interior angles of all triangles add up to 180 degrees
Yes the 3 interior angles of any triangle add up to 180 degrees
All of the angles in a triangle add up to 180 degrees.
180 degrees. All triangles do.
Yes the 3 interior angles add up to 180 degrees
The 3 interior angles of all triangles add up to 180 degrees
Interior angles of all triangles add up to 180 degrees.
Yes. The three angles of a triangle always add up to 180 degrees.
All Triangles add up to 180 degrees, no matter if it is Right or Scalene or ANY TRIANGLE!! If it does not, it is not a triangle!
Triangles whether acute, obtuse, equilateral or scalene will only ever have angles that add to 180 degrees.
180 degrees, like all triangles.