Have a geometry concept that always tripped you up? Reply in the comments—we’ll build an interactive lesson for it.
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. geometry-lesson.github
If you’ve ever tried to learn geometry from a static PDF or a dusty textbook, you know the struggle. You stare at a triangle on page 142, squint at the dotted lines, and wonder: "Does angle C really look like that? Or did the printer run out of ink?" Have a geometry concept that always tripped you up
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] Clone it, break it, fix it
Why Your Geometry Textbook Lies (And How GitHub Can Fix It)