Geometry.lessons.github May 2026

Imagine instead an .html file in a GitHub repo – one that uses p5.js or Three.js . You can drag points, see angle measures update live, and watch a proof unfold step by step.

If you’ve stumbled across geometry.lessons.github , you might be expecting a repository. But it’s more than that: it’s a philosophy.

Now your diagram and its explanation never drift out of sync. The .github suffix hints at community. Anyone can propose a better explanation of the Law of Cosines, or translate a lesson into another language, or add accessibility features (screen‑reader‑friendly shape descriptions).