What type of triangle has one angle greater than 90 degrees?

A triangle with one angle greater than 90 degrees is specifically known as an obtuse triangle. In obtuse triangles, the angle that exceeds 90 degrees is referred to as the obtuse angle, while the other two angles must be acute, ensuring that the sum of all three angles remains 180 degrees.

Acute triangles, on the other hand, have all angles measuring less than 90 degrees, so they do not fit the criteria. Right triangles contain one angle that is exactly 90 degrees, and equilateral triangles have all angles equal to 60 degrees, characterized by their equal side lengths. Hence, the only type of triangle that aligns with a single angle being greater than 90 degrees is indeed the obtuse triangle.