I shared some of this last year, on my Beginning Proofs INB Pages post, but this year I did things a little differently.
I used this flapbook for the angle pair theorems and postulates. This time, I had my students write out the theorems underneath the flaps and also write the shorthand they are allowed to use in proofs. I leave my honors students a little more open-ended so that they have to fill in important information themselves. I'm trying to help them learn how to be good notetakers. I can't just turn them lose though, because most of them are freshmen!
This year, I added this page with two practice proofs. It is now part of the exclusive content in my geometry foldable bundle. I think it helped my students understand the proofs a little but better and I'm SO GLAD I had my students do the proof of the theorem. I don't think I prove theorems enough in class and this was a good addition to the lesson.
I'm happy with the way this lesson has evolved over the years. I think the Congruent Complements/Supplements Theorem are hard for students, but proving the theorem did help. I think this is the best that I've taught it, and my students are comfortable with all of the theorems.
I love all of your resources,so thank you for sharing them! Isn't the linear pair postulate just the second part of the angle addition postulate?
ReplyDeleteI teach the Linear Pair Postulate separately. Yes, it could be considered a corollary of the Angle Addition Postulate, but since it is a special case where the angles always equal 180, it has a special name. I require students to write "Linear Pair Postulate" when writing proofs, because it is more specific.
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