1.tri- just like 3
2-Angle- just an angle
thats classification for yas all lol
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An isosceles triangle and an equilateral triangle
might be an equilateral triangle. isosceles triangle or a right angled triangle :)
trtdrtdrtd
In two dimensions, lines can be parallel, angles cannot. So no plane shape has parallel angles.
It is an indication of an error, or the fact that the triangle is not in the Euclidean plane but on a convex surface.