It's time for triangles in my geometry unit.
I'm using a couple of resources from the Math is Fun site.
Interactive Triangle and Angle makers
You can drag and pull into different angles and triangles.
Songs are a must too. My students love when I teach concepts through music.
I love when I hear my students (yes, third graders), singing learning songs on their way out to recess or lunch. It shows they were certainly paying attention.