For example, the conclusion is that the line segments are equal, which proves that most of them are congruent, or we can do it through the equilateral nature of isosceles triangles to see whether the two line segments are in one triangle or in two triangles.

Prove that the angles are equal: congruent, or similar. In the problem of having a right angle, it depends on whether the complementary angle of the same angle is equivalent or equivalent.