Volume XIII of Elements deals with the construction of the five regular Platonic solids (pyramid, cube, octahedron, dodecahedron, icosahedron) inside a given sphere.
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The thirteenth book of "Euclid's Elements" is called regular solids. In this final book, Euclid names and describes the properties of the five regular solids and ends it by proving no other regular solids exist.
It was called The Elements the 13 volume
Regular solidsRegular solids
Elements
There are 13 different books in "Euclid's Elements". There is not a specific name for the 13th book but it is about Pythagoreans.