I used this One Big Square Task with my trigonometry students to review 45-45-90 special right triangles. I found this task in the Open Curriculum Task Database. I loved listening to the conversations my students had as they struggled through this problem. And, I mean “struggle” in the best possible way! Free Download of One …

# Triangles

I found this dragon puzzle to practice special right triangles online, and I fell in love with it. Each of the triangles is a special right triangle. I did a bit of research, and I was able to find the original source. I also found the same problem in McDougal Littell’s Geometry: An Integrated …

I created this special right triangle discovery activity to help my trigonometry students discover (or rediscover) the patterns in the sides of the 30-60-90 and 45-45-90 special right triangles. 45-45-90 Special Right Triangle Discovery Activity The page I’m showing you FIRST is actually what we did LAST. Yes, I’m that teacher who makes my students …

Since I’m teaching trig this year, I wanted to create some special right triangles posters to jog my students’ memories. Special right triangles are a topic they study in geometry but have often forgotten by the time they end up in my trig class. I designed the title to print on 8.5″ x 11″ and …

I created this set of free printable pythagorean triple posters to help decorate my new classroom. I’m teaching Algebra 1, Trig, and Math Concepts (a class for 9th graders not yet ready for Algebra 1) this year. As I was making a list of things my trig students need to review at the beginning …

SOH CAH TOA. The mnemonic device that sums up the majority of the population’s knowledge of right triangle trigonometry. Today I want to share a free download of a SOHCAHTOA Poster I made for my own classroom. Yesterday, I printed off a heap of posters and started laminating them. Earlier this summer, I had …

I’m excited to share my student’s creative wheel of theodorus projects which I turned into a Wheel of Theodorus Bulletin Board to decorate my high school math classroom. Every year, I have this plan to change my bulletin boards out throughout the school year. This year that happened only once. It also happened way back …

I learned about the song Gettin’ Triggy Wit It by WSHS on YouTube from Meg Craig. It was the perfect addition to our unit on right triangle trigonometry. If you haven’t seen this video, stop everything and watch it now. My students enjoyed the video the first time we watched it, but they had a …

I created this SOH CAH TOA foldable for my trigonometry students to glue in their interactive notebooks. Our geometry standards include basic right triangle trig, but I’ve found that my students’ experience with this topic is greatly lacking. They remember learning SOH CAH TOA, but they never really did know what they were doing. It’s …

These are the pythagorean theorem notes I used with my trigonometry students in our beginning of year geometry review. We glued these notes in our trigonometry interactive notebooks. The Pythagorean Theorem booklet was stole from the blog of Jessie Hester. She has a ton of resources for teaching the Pythagorean Theorem! If I was teaching …

I created this special right triangles practice book for my trigonometry students to glue in their interactive notebooks as part of our beginning of the year geometry review. This was our last topic to review before delving into actual trigonometry. I don’t know exactly what it is about special right triangles, but I LOVE them. …

I worked through this shadows task that involves similar triangles at a 2013 Common Core Workshop I attended (OGAP). I am blogging about the activities we did last summer so that they are easier for me to find when I go to plan lessons. I hope these ideas will inspire you as well. I found …