@Beno10_MFC 120°. There is a error in the numbers. Both triangles are identical. And the bigger in is equilateral bc it has two 60° angles.
So the smaller ones angle can't be 45°, it's 60° and so is the other one. 180°-60°=120°
@DHuskytron Murphy's law, if it can be done inccorrectly, someone will do it. But it's not just that, we live in a time where everyone does it. Some few inviduals and their families living in their own bubble won't change society.