books.google.com - Often called the Father of Geometry, Euclid was a Greek mathematician living during the reign of Ptolemy I around 300 BC. Within his foundational textbook "Elements," Euclid presents the results of earlier mathematicians and includes many of his own theories in a systematic, concise book that utilized...http://books.google.com/books/about/The_Thirteen_Books_of_Euclid_s_Elements.html?id=KFZafDLIPr4C&q=polygon&utm_source=gb-gplus-shareThe Thirteen Books of Euclid's Elements

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## The Thirteen Books of Euclid's ElementsBy Euclid |