I like his proof of a the volume of a cone. I usually considered it via Euclid XII, prop 7, which was always hard to visualize. Starting with 6 pyramids in a cu

I like his proof of a the volume of a cone. I usually considered it via Euclid XII, prop 7, which was always hard to visualize. Starting with 6 pyramids in a cube is ingenious. https://mathcs.clarku.edu/~djoyce/java/elements/bookXII/propXII7.html https://mathcs.clarku.edu/~djoyce/java/elements/bookXII/prop...