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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There are 13 books making up Euclid's 'Elements'.
The Elements which are 13 volumes
Regular solidsRegular solids
There are 13 books in Euclid's Elements.
Euclid's "The Elements," is a geometric treatise consisting of 13 books written by him circa 300 BC. However, it was compiled from the works of several earlier mathematicians from earlier centuries.