Elements

13 Books of Euclid

This digital reference of Euclid's Elements is assembled from several English translations from over 100 years ago that are now in the public domain. The purpose of this project is to facilitate research and study of the dense information of the 13 books through intelligent navigation, robust taxonomies and comprehensive search.

  • Majority of text from 1908 Heath edition from Perseus project

  • Book subtitles taken from 1885 Heiberg edition

  • Book summary and graphics taken from 1885 Casey Edition

  • Element subtitles by Phi

Books : 13

Book I

Fundamentals of Plane Geometry Involving Straight-Lines

Theory of angles, triangles, parallel lines, and parallelograms.

Book 2

Fundamentals of Geometric Algebra

Theory of Rectangles

Book 3

Fundamentals of Plane Geometry Involving Circles

Theory of the Circle

Book 4

Construction of Rectilinear Figures In and Around Circles

Inscription and circumscription of triangles and of regular polygons in and about circles

Book 6

Similar Figures

Application of the theory of proportion

Book 11

Elementary Stereometry

Theory of planes, coplanar lines, and solid angles