by John on (#6ASRW)
The new book A Panoply of Polygons cites a theorem Euclid (Proposition XIII.10) saying If a regular pentagon, a regular hexagon, and a regular decagon are inscribed in congruent circles, then their side lengths form a right triangle. This isn’t exactly what Euclid said, but it’s an easy deduction from what he did say. Here’s […]The post A pentagon, hexagon, and decagon walk into a bar … first appeared on John D. Cook.