The 3 interior angles of any triangle add up to 180 degrees
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ALL triangles - have internal angles that add up to 180 degrees.
No, a triangle cannot have two angles. Triangles always have three sides and three angles that add up to 180 degrees.
Yes, they can have obtuse angles. A triangle can have any combination of angles as long as all interior angles add up to 180*
Yes the 3 interior angles of any triangle add up to 180 degrees
All triangles have 3 interior angles that add up to 180 degrees and the 4 interior angles of a quadrilateral add up to 360 degrees but if 2 of its vertices are joined by a diagonal this marks out 2 interior triangles each having 3 interior angles adding to 180 degrees.