Head over to (or check the repository on GitHub). Clone it, break it, fix it. And the next time someone tells you that the sum of the angles in a triangle is 180°, don't just nod.
Drag the vertex. Prove them wrong. (Spoiler: On a sphere, it’s more than 180°. We’ll cover that next week.) 👉 [Visit the Live Demo] 👉 [Star us on GitHub] geometry-lesson.github
Why Your Geometry Textbook Lies (And How GitHub Can Fix It) Head over to (or check the repository on GitHub)