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Euclid, "The Elements," Books I-IV

Euclid, "The Elements," Books I-IV

A clear, graphical walk-through of Euclid's "Elements", books I-IV. The site also includes explanations of the Postulates, Definitions, and Common Notions. It is based on Heath's translation of Euclid.


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William McGrath
William McGrath (Student)
15 years ago
This site is fantastic. The main pull is the graphical walk-through of each Proposition in Book I of Euclid's "Elements." The most confusing proofs and constructions are laid out in a clear, step-by-step approach, with each new piece of the proof being added to the diagram through simple animation. Books II, III, and IV are also present. The only drawback is the lack of material after Book IV.

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Almost too easy to use.
Used in course? Yes