Lesson 3 - Congruent Triangles As the title implies, this lesson, and what we learned in this lesson was very similar to what we learned in the previous lesson. The content still involved the triangle congruence postulates, including SSS, SAS, ASA, AAS, and HL. But there was 1 difference; this lesson focused greatly on how to apply those postulates in proofs and to solve problems. We were given many questions and situations in which we had to do some sort of mathematical procedures that involved the triangle congruence postulates. Some of the activities include proving the congruence of two triangles, finding the solution to scenario/word problems, or even finding missing values or information in a diagram. Basically, this entire lesson was 1 giant application.