Which type of triangle has no congruent sides?

A triangle that has no congruent sides is classified as a scalene triangle. In scalene triangles, all three sides are of different lengths, which also implies that all three angles are of different measures. This characteristic sets scalene triangles apart from isosceles triangles, which have at least two sides of equal length, and equilateral triangles, where all three sides are congruent. Right triangles can be scalene or isosceles depending on the lengths of their sides, but the defining feature of a scalene triangle is the lack of any congruent sides. Therefore, the correct classification for a triangle with no congruent sides is scalene.