As collected in Elements, they are...
Book I. The fundamentals of geometry: theories of triangles, parallels, and area.
Book II. Geometric algebra.
Book III. Theory of circles.
Book IV. Constructions for inscribed and circumscribed figures.
Book V. Theory of abstract proportions.
Book VI. Similar figures and proportions in geometry.
Book VII. Fundamentals of number theory.
Book VIII. Continued proportions in number theory.
Book IX. Number theory.
Book X. Classification of incommensurables.
Book XI. Solid geometry.
Book XII. Measurement of figures.
Book XIII. Regular solids.
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The chapters in Euclid's Elements are called books, there are thirteen in all.
There are 13 books. Book 13 is about regular solids.
Euclid's Elements is a set of thirteen mini-books and sometimes found as one whole book. The thirteenth book it titled Regular Solids.
Euclid's elements are a set of 13 books on mathematics written by the Greek mathematician Euclid around 2,300 years ago.
13 of them.