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There are 13 books in Euclid's Elements. The title of Book XIII is " Regular solids."
Because he contributed most to geometry. His work can be found in the Elements. It is divided into 13 books. Books 1-6 dealing with plane geometry. Books 7-8 about number theory. Book 9 on irrational numbers. While books 10-13 about three-dimensional geometry. answered by-G.L.R.-
thirteenagon
A 13-sided polygon can either be called a triskaidecagon or a tridecagon.
N-gon is the name of 13-20 sided polygon.