Description: Sal shows that a given pair of pentagons are not congruent by showing it's not possible to map one onto the other using rigid transformations. Created by Sal Khan. And the way we're going to test that is by trying to transform this figure by translating it, rotating it, and reflecting it. So if these two things are congruent, looks like point E and the point that I'm touching right now, those would correspond to each other. Let me try to rotate it a little bit.*Teacher Advisor is 100% free.