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The Elements is a mathematical treatise consisting of 13 books attributed to the ancient Greek mathematician Euclid c. 300 BC. This edition includes interactive versions of the propositions, statements followed by a proof of the statement. Each statement of the proof is logically justified by a definition, postulate, common notion, or an earlier proposition that has already been proven.
Table of Contents
Book I
Euclid's Elements, Book 1, Prop 1: Equilateral Triangle