What do you call a triangle with one angle greater than 90 degrees?

A triangle with one angle greater than 90 degrees is known as an obtuse triangle. This type of triangle can be identified by its unique characteristic of having one angle that measures between 90 degrees and 180 degrees, which differentiates it from other types of triangles.

In contrast, an acute triangle has all three angles measuring less than 90 degrees, while a right triangle contains exactly one angle of 90 degrees. A scalene triangle is defined by having all sides of different lengths and does not specify the angle measures. Therefore, the defining feature of an obtuse triangle is its ability to accommodate that one angle exceeding 90 degrees, making it the correct classification in this scenario.