Triangles can only have an internal angle sum of 180, if you have two angles at 90 degrees, their sum would be 180 leaving no more degrees to create the last angle.
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A triangles angles must add up to 180 degrees, no more or less
Yes there cant be more than one right angle in a right triangle
tri as in 3 angles as in the ends . He's right but i wil explain more. Equilateral triangles get there name from all sides being equal hence the name equilateral. Right triangles get there name from having a right angle, or ninety degree angle. I don't know about iscoceles.
if it is a perfect L, it is a right angle. if it is more then perfect, its an obtuse if it is less than perfect, /_, it is acute
In the geometry of triangles, there is no such thing as stability.