**Axiom**: 1.3: Segment Extension

### (Postulate 2 from Book 1 of Euclid’s “Elements”)

And to produce a finite straight line continuously in a straight line.

### Modern Formulation

A segment may be extended from any length to a longer segment, a ray, or a straight line.

| | | | | created: 2014-07-02 22:50:57 | modified: 2019-03-23 08:20:39 | by: *bookofproofs* | references: [626], [628], [6419]

### CC BY-SA 4.0

[626] **Callahan, Daniel**: “Euclid’s ‘Elements’ Redux”, http://starrhorse.com/euclid/, 2014

### Freely downloadable

[6419] **Fitzpatrick, Richard**: “Euclid’s Elements of Geometry”, http://farside.ph.utexas.edu/Books/Euclid/Euclid.html, 2007

### Public domain

[628] **Casey, John**: “The First Six Books of the Elements of Euclid”, http://www.gutenberg.org/ebooks/21076, 2007

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