Wednesday, April 30, 2014

3 Dimensional Figures

I got this great idea here and updated it (not much) for my high schoolers. It always surprises me how much geometry they are "taught" in the earlier grades that they don't remember once they make it to high school.
I like to have my notebook items in printable format, even if I make my students create them from scratch. It helps to have the option of just printing one for the kid that can't write legibly, or the one who freaks out about writing on something that has glue on it, or the one who takes 10 times longer than everyone else to cut... Did I mention I teach 16-18 year-old's?

Monday, April 28, 2014


We didn't even get close to finishing all the stuff on circles. We talked mostly about angles and arc measures. A little bit about sector/segment area and lots of vocab. Here's all our circle stuff. Enjoy!

Page 43 - Arc Measure

 Page 44 - Circumference and Arc Length


Page 45 - Area of Sectors and Segments

 Page 46 - Inscribed Angles

And then my document camera stopped working. I created the next few pages using PowerPoint. My digital projector has zoom and freeze functions. I use those so that students can see what I'm working on in real time. 
(That is how I created PowerPoints for every section in the book. My coworkers were very impressed with me until I showed them that little trick. I would zoom in and draw all the stuff first block, then add all of the animations to it during my planning. Then I could walk around during my next two classes. I'm a big fan of "cheating" aka: "using your resources.")

 Page 47 - Parts of a Circle

Page 48 - Crossing Lines and Arc Measures

Luckily, my sympodium still works. That made filling in the examples MUCH easier. I could have done it in PowerPoint (because I am a ninja) but it would have taken much longer for the same result. This is a one-slide PowerPoint that is animated to show the flaps opening and closing. It is not easily printable.  Free here. 

We didn't talk about tangent lines or secant lines, or I would have used that terminology. We really ran out of time for this chapter so I stuck in whatever I could. 

Monday, April 14, 2014

Grudge Ball

I got this GREAT idea from To Engage Them All for a game called Grudge ball. Think: Survivor meets Trashketball. What is Trashketball, you say? It's a review game where a kid solves a problem or answers a question, then shoots a ball into the goal, an empty trashcan. If you've never heard of Trashketball, maybe your district gets money for classroom supplies and you've splurged on a nice NERF ball and goal to hang on the wall.  The difficulty of this classic game can be increased by pulling the trashcan away from the wall and using a very heavy ball. If they tip over the trashcan, it doesn't count!

Grudge ball takes this to a new level: a level filled with evil. Instead of earning points, they're erasing them from another team. It. Was. Epic. To say that my students loved it would be an understatement.

Things I learned:

  • Groups of 3 work better than 4. Because they are more likely to all work, instead of relying on "the smart kid" in the group. 
  • All students must stay seated. The only one who can stand is the one taking the shot and erasing the points. There were some issues with cheating, trying to copy another team's work "I'm going to get a tissue!" "I need a calculator!" 
  • Classes full of boys will eat this up. Girls will call each other names and/or cry. 
  • Allow the team whose turn it is the entire time (I set the timer on my PowerPoint slides to 3 minutes) to solve the problem. If they get it wrong, try again until time runs out. If they still get it wrong, another team can steal. I didn't use this rule in one class and the "steals" were out of control. It really came down to the one kid who could do them faster than anyone else controlling the game. Not fun. That kid's gonna get jumped after class. 
  • I might institute a "Pass the Marker" rule next time. One kid usually hogged it in each group.
You can use my PowerPoint if you're studying Arc Length and Area of Sector & Segment. (In fact, you could probably modify it to work for WHATEVER you are studying!) It's FREE on TpT!


Thursday, April 10, 2014

Symbols in Geometry

I need to add this page to my Interactive Notebook Build Day next year. It feels silly to add it 5 weeks from the end of school. Anyway, it's free on TpT! 

Thursday, April 3, 2014

Pythagorean Theorem

We made this neat little slider for our notebooks. We glued around the edges of the info sheet, and cut out little windows. Then the insert can be pulled out to the appropriate place when they solve the problem and the second window shows what type of triangle it is! Very cool, and available for FREE on TpT.

Below are the updated pages that we used this year.

Tuesday, April 1, 2014


We began our area unit yesterday with a few easy pages. Today we are doing a Quilt Area activity using scrapbook paper.

Each square should look something like this: 

Area project worksheet and templates available for free on my TpT store.