180 or pi...
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right angle triangles have a 90˙ angle as one of their angles. All triangles' angles have to add up to 180˙, so the total of the remaining 2 angles has to be 90˙. Other regular triangles are non-specific, their angles just have to add up to 180˙ total.
All right angle triangles have a 90 degree angle and two acute angles that add up to 90 degrees
I'm not sure what you mean but the angle sum (what all the interior angles add up to) is 180 degrees.
No, only right angle triangles, but all the angles in a triangle will add up to 180 degrees.
All triangles have 3 sides and 3 interior angles that add up to 180 degrees and they are: scalene, right angle, obtuse, isosceles and equilateral triangles