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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euclids elements
There are 13 books in Euclid's Elements.
i think that euclids elements were everything we know about geometry and that we will soon know a lot more about this subject because we are finding new things every day and soon someone will find out something new about geometry
eetrgrv
There are 13 books making up Euclid's 'Elements'.