So I decided to talk with the students about proof. Students are definitely challenged by the concept and this is going to be a long road. To ease the road, I decided to introduce the two column version and flowchart version of the vertical angles proof. I think that this is the beginning of paving of a long road. The lesson ran a bit long and I decided to spend time on making sure the explanation was sound and did not spend time on a solid formative assessment. I look forward to building on the concept.