Elements

by Euclid · c. 300 BCE

The First Six Books of the Elements, John Casey's edition. 9 parts, about 87,047 words, 7 hours of reading. Source edition.

The reading guide →

Passages the guide marks

A point is that which has no part.
Book I, Definition 1 · Read it in Book I: Theory of Angles, Triangles, Parallel Lines, and Parallelograms
Let the following be postulated: to draw a straight line from any point to any point.
Book I, Postulate 1 · Read it in Book I: Theory of Angles, Triangles, Parallel Lines, and Parallelograms
That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles…
Book I, Postulate 5 · Read it in Book I: Theory of Angles, Triangles, Parallel Lines, and Parallelograms
In right-angled triangles the square on the side subtending the right angle is equal to the squares on the sides containing the right angle.
Book I, Proposition 47 · Read it in Book I: Theory of Angles, Triangles, Parallel Lines, and Parallelograms
Prime numbers are more than any assigned multitude of prime numbers.
Book IX, Proposition 20

About this text

Public domain in the United States; the Project Gutenberg edition is free of restrictions under the Project Gutenberg License. Translated by John Casey. It is not the edition the programs assign; the guide names that one, and the buy links there point at it.

Contents