An obtuse triangle is a triangle that has one angle greater than 90 degrees.
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A triangle can have at most one obtuse angle, but triangles do not necessarily have any obtuse angles.
There are no obtuse angles in a square. A square is a perfect 90 degree angle.
A triangle can have either zero or one obtuse angles, but no more than that. An obtuse angle is one that is greater than 90 degrees. The interior angles of a triangle always add up to 180.
The total number of degrees in a triangle is 180. this will not change no matter what type of triangle it is. (obtuse, acute, right angle, etc)
None normally but if it is in the shape of an isosceles triangle then it will have 2 equal sides.