## Thursday, August 16, 2012

### Parallel Lines & Transversals

I've been so caught up in my classroom that I've taken a break from posting ISN stuff.  I went through my various ISN's and picked some pages that I haven't shared yet.  Today I'm going to show off one of the last ones I did with my summer geometry class.

This is on the angles formed by parallel lines & transversals.

First I handed out this picture which many of them had seen before and we discussed which angles were congruent.  I told them they couldn't color yet though.

They chose a crayon and colored angle 1.  Then I let them also color angle 4 because we had discussed vertical angles the day before.  Next I introduced corresponding angles and let them color 5 and 8.

On this sheet (which is under the diagram) they recorded the descriptions and listed examples.  I would give them one example and they found the rest.

Then we did the same with alternate interior/exterior angles, showing and labeling on the figure where the interior and exterior are.

After going through this, I had them do an activity I found on Dan's post here.  I loved it because it was really challenging for them.  For the kids that I had, this was their first real introduction into proofs or having to really justify their work.

If I were to do this again, I would go through the first few steps with them more slowly.

I would also make plenty of extra copies.  A lot of kids didn't really listen to directions and just filled in every angle with either 130 or 50 and said they were done.  They then needed an extra copy to start over.

Once they got the hang of it though, they did really great.  I loved that there were many different ways to justify a lot of the angles so most of the kids had different work showing me that they really thought about it them self.

The really nice thing about this activity was that the kids all referred back to their colored diagram the entire time.  They would look at the puzzle and then try to find two angles that looked similar and then they would look up the name of the angle pair.  As math teachers we might overlook the significance of the colors in this activity because we can easily "see" that the angles are equal, but we need to remember that not all kids see it the same way.  The color really helps this idea to clearly stand out.

1. This is great! I love puzzles and I've just been doing angles in parallel lines with a class. Thanks!

1. Cool! If you click the link where I got it from, there are some more really good ones there.

2. Awesome! Great resources. Thanks again :)

2. I'm just about to begin this section with my Special Education Geometry Students and I love this plan! Thanks for the resources.

1. Awesome! Hope it goes well for you :)

3. When I clicked your link for Dan's activity I couldn't find the problems shown in your picture. Did you make those up or am I looking in the wrong spot on his website?

1. If you scroll through the post a little bit there is a link that says:
Discussion Problems: Parallel Line Mazes

If you click there it takes you to the post with more of them

4. Are you able to post the files you used for the diagram/chart? I'd love a file that I can modify to add more vocab. Let me know. Thanks a bunch!

5. I'm a fan of the first diagram with the color coordination and labeling of interior and exterior. Will be stealing. Thank you!

6. Quick question -
You can't assume the transversals are parallel, right? So you can't assume that <1 and <13 are congruent? Correct??

7. Hi Sarah,

First of all- thank you for sharing everything on this blog!!! A lot of your work has inspired me to take on an ISN with my 8th grade class this year, and I couldn't be more grateful for all that you have shared!! I may even need to start a blog of my own, because now I am just having so much fun with this ISN!

Do you by any chance have an original file for this diagram and chart? If not, I will re-create something similar to it on my own, but figured I would ask!! Thanks!

Kate

8. Hi,

Could you post the files also. I would love to use this. So simple and brilliant! Color with purpose!

9. Do you have the blank templates available?

10. Do you have the blank templates available?

11. Hi

Do you have pdf's of these templates for the ISN?

12. Do you have PDF's of these templates?

13. I am also interested in the pdf or other form of the templates. Are they available?

14. Again, lots of frustration with trying to find links to these templates. Who has time to create all this stuff? I don't even mind paying for it on TPT, but at least provide a link!

15. Hi! Is there a link for the pdf of these? These are great!

16. I was not able to find the link, is there a pdf available?
This is great for my support students!