As we wrap up our first geometry unit this week, one thing we begin to discuss are auxiliary lines. My students already have so much background knowledge on parallel lines cut by a transversal from their middle school days (and our first few days of the year), so I wanted a short task to get them connecting what they've done before with where we are headed next.
Auxiliary Lines Warm Up
I designed this task as a way to get students thinking independently about how auxiliary lines might help us. The above diagram was given to them, along with a bunch of questions about angle pairs and measures. I had them work on this individually after they finished a quiz, then find a high five partner around the room with whom they could discuss their answers. For many this was a "duh" kind of activity. It transitioned well into more complicated diagrams, giving us a foundation to which we could refer.
Here's the actual Word file:
Two Truths and a Lie
I was inspired by this one from Math=Love Two Truths and a Lie Activity Template post, in which she had students create their own version of Two Truths and a Lie on a particular topic. This brief activity had students decide which statement was a lie and then explain why. They worked in partners and we debriefed as a class. In my more talkative classes it sparked a lot of debate. In my less talkative it involved a LOT of creeping on students' papers and calling on the right kids to share their answers (which some did not appreciate, especially on a 90 degree day during first block). Overall, though, I liked it and would the format again for other topics!
Again, the Word file:
Nothing groundbreaking but if anyone can use it, please steal!
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