A triangle with one right angle is referred to as what?

A triangle with one right angle is referred to as a right triangle because it is defined by the presence of a 90-degree angle. This specific angle is what sets it apart from other types of triangles. A right triangle can also be characterized by its properties in relation to the Pythagorean theorem, which applies specifically to right triangles, stating that in such triangles, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

The other types of triangles mentioned do not contain a right angle. An obtuse triangle has one angle greater than 90 degrees, while an acute triangle consists entirely of angles less than 90 degrees. A scalene triangle, on the other hand, refers to a triangle where all sides (and therefore all angles) are of different lengths and measures, but it doesn't necessarily imply the presence of a right angle. Thus, the correctness of identifying a right triangle rests on its defining characteristic of having one angle that is exactly 90 degrees.