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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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