Watch Great Thinkers Great Theorems online: Episode 4 Euclid's Elements - Triangle and Polygons

Thousands of years later at the end of the 18th century, Carl Friedrich Gauss looks back into Euclid and finds something that Euclid had missed. When we get to that, many, many lectures down the road, we will be constructing regular polygons again. This is one of those things where “what’s old is new again.”

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