When I’m designing a lesson, one of my go-to tactics is to fight against my own “Curse of Knowledge.” The more familiar we become with a topic, the harder it gets to remember that there are lots of unexpected surprises. We take them for granted and rob lessons of curiosity.

Approach your lesson planning with a beginner’s mind, wondering: if I knew *nothing*, what would be unexpected about this topic?

### So What’s The Twist With Triangles?

I was looking for my next batch of Byrdseed.TV topics, browsing through the math standards (as you do!) when I started focusing on triangles.

What are the unexpected twists, interesting patterns, or chances to allow my students to discover something here?

- I’d always tell my students that a triangles’ angles
*have*to sum up to 180º. But, friends, imagine allowing students to*play*with triangles, building ten different triangles and*then*asking them to sum up the angles. - Imagine challenging students to create a triangle with a right angle. Then, challenge them to create a triangle with
*two*right angles! As they realize it cannot be done, discuss! - Pose the question: what’s the
*largest*angle you can create inside of a triangle? - What happens when we make one of the triangle’s angles very small? What happens to the other angles?
- What if we make one angle very very large? What happens to the other angles?
- You could also extend these wonderings to side lengths. When we make an angle big, what does it do to the triangles’ sides?

### Build Around Unexpected Patterns

The angles inside of a triangle may not seem inherently interesting. The fact that the angles must sum up to 180º may seem like a dull fact we have to just tell kids. But, if we approach this topic purposefully looking for surprises, there are lots of interesting discoveries that we can set up for our students.

This tactic is the idea behind inductive learning: human brains are *really* good at pattern recognition. Lessons that build on patterns are naturally in line with the human brain, which means better learning and more dopamine! And **I guarantee** you that when students *discover* these properties, they’ll remember them far better than if you just told them.

All of this triangle thinking eventually turned into this lesson over at Byrdseed.TV.

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