So, the next time you need to prove that the angles of a triangle sum to 180 degrees, skip the protractor and paper. Open your browser, search for , and start dragging. You will never look at a shape the same way again.
Open-source geometry resources on GitHub Pages facilitate interactive learning through tools like dynamic geometry labs and computational geometry libraries, supporting topics from competitive programming to 3D visualization. These materials often integrate interactive visualization with code-based modeling and structured, open-source curricula. For a collection of computational geometry resources, see the Awesome Computational Geometry GitHub repository Handbook of geometry for competitive programmers geometry lesson github io