# Axiom:Euclid's Second Postulate

## Postulate

A straight line segment can be extended indefinitely to form a straight line.

In the words of Euclid:

To produce a finite straight line continuously in a straight line.

### Production

The process of extending a straight line segment is called production.

Such a straight line segment is said to be produced.

The line segment can be extended in either direction, thus producing an infinite half-line, or in both directions, thus producing an infinite straight line.