What type of triangle has two sides that are of equal length?

An isosceles triangle is defined specifically by having two sides that are of equal length. This characteristic distinguishes it from the other types of triangles. In an isosceles triangle, the two equal sides are often referred to as the "legs," while the third side, which is different in length, is called the "base." Additionally, isosceles triangles can have angles that are equal to each other, specifically the angles opposite the equal sides.

In contrast, a scalene triangle has all sides of different lengths, with no sides being equal. An equilateral triangle features all three sides of equal length, making it a specific type of isosceles triangle, but it does not fit the question’s requirement of only two equal sides. A right triangle is defined by having one angle that measures 90 degrees and does not inherently require any sides to be of equal length. Thus, the most fitting classification for a triangle with two sides of equal length is indeed an isosceles triangle.