What type of triangle is characterized by having all sides of different lengths?

A triangle that has all sides of different lengths is called a scalene triangle. In geometry, a scalene triangle is defined by its unique side lengths; no two sides are the same. This differentiates it from other types of triangles, such as equilateral triangles, which have all three sides equal, and isosceles triangles, which have at least two sides that are equal in length. A right triangle refers specifically to a triangle that contains a right angle, and it can be scalene or isosceles, but that aspect does not pertain to the lengths of the sides being distinct. Therefore, the identification of a triangle with all sides of different lengths as scalene is precisely correct.