YES
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yes angle in triangle always add up to 180 degree
The three angles inside any triangle always add up to 180 degrees. Any triangle.
The sum of the three included angles of a triangle always = 180 degrees. So if one angle = 180 degrees (a straight line) then the other two included angles will be = 0 degrees which cannot make a triangle.
There is no such triangle because the 3 interior angles of any triangle always add up to 180 degrees
The sum of all of the angles of a triangle will ALWAYS be 180 degrees.