Today was the real start of similarity. Yesterday we got into it a bit at the end but there was too much excitement over the tin men. It wasn’t all that exciting of a day – lots of notes and then practice and then notes and then practice. The roughest part was similarity in right triangles. In the past, I’ve just told them the proportions to set up with the geometric mean like my teachers did with me and then went on with the unit. I thought it would be a good idea to prove this relationship this year…not the best idea. Or probably more likely I just didn’t do the best job of making it work. It just seemed like a bunch of random letters and redrawing and was kind of a mess…I still think proving it would be the best way for the students to truly understand why we have the geometric mean in right triangles with an altitude, but next year I will have to find a better way.
Il y a toujours l’année prochaine!