[today I learned] half-rectangle triangles

Today I learned to make half-rectangle triangles! I followed this tutorial (which I've read about a hundred times). It is surprisingly easy, except for the tricky bit where you have to hold pieces together strangely. But that could be easily solved with pins (I just don't do pins). So far, I've made like 24 half-rectangle triangles. The process makes two at once, so it goes pretty fast.

I'll be sharing more about this project in the future, but for now it's a secret!