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Lines, half lines and line segments

Do you remember what a **straight line** is?

Do you remember what a **straight line** is?

Discover how to draw **half lines** and **line segments** starting from a straight line.

Learn all you have to know for the next **geometry** test!

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Table of contents of this lesson: Lines, half lines and line segments

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Learn FREE with videos and interactive exercises

## VIDEO - STRAIGHT OR CURVE LINE

A **line doesn't have ends **and it** always goes to the same direction**: it is straight, it has no curves and always goes to the same point.

Let's use a **small letter** like *r*, for example, to name lines.

You can draw a line in different orientations: it can be **horizontal**, **vertical** or **diagonal**.

Draw two points on a line. Look! You've just found a **line segment**!

A **line segment** is a **part of a line** that is bounded by **two points**, also known as **end points**. The end points are name A and B.

Draw a point on a line: what happened? The point divides the line into two parts: the half lines.

A **half line** is a line that **starts in a point but doesn't have an end**. The **initial point** is the point O.