Lesson 5 - Triangle Congruence Proofs, CPCTC, & Beyond If you've been reading these notes at all, you will notice that for the past 3 lessons, we have been focusing greatly on everything involving triangle congruence. And if there was a simple way to summarize what we learned in Lesson 5, I would say that this lesson basically wrapped up everything we learned about triangle congruence. There was really nothing new that we learned, and I went through a whole lot of questions. And just like the lesson did, I will briefly mention what this lesson reviewed. The SSS Postulate, the SAS Postulate, the AAS Postulate, the ASA Postulate, and the HL Postulate. Really, if you think about it, just like Lesson 3 was an, "application," this lesson was the, "assessment."