Line-Segment, Ray and Line

Definition of in Line-segment, ray and line geometry:

The part of a line is called a line-segment as shown below.

Definition of in Line-segment

Line segment AB

Line segment CD

Only one line can be drawn passing through any two points but a number of lines can be drawn through a point.

Lines passing through a point O

Line AB

Lines passing through a point O

Line segment CD

Ray: We know about sun-rays. A sun-ray starts from the sun and goes on a direction up to endless space. Similarly a geometrical ray is considered a special kind of line which starts from a fixed point and goes to any distance to the other direction of the starting point.

A Geometrical Ray

The name of a ray is given with two capital letters. One letter is written at the starting point of the ray and the other letter is written near the arrow end as AB and LM.

A line, line segment and ray all are called one dimensional (1-D) figures as they have only length.

Distinction between line-segment, ray and line:


1. It has two end points.

2. The length of a line-segment is definite. So, it can be measured.

3. The symbol of a line-segment is _____


1. Ray has one starting point and another near the arrowhead.

2. It has a starting point but no other end point. So, its length cannot be measured.

3. The symbol of a ray is


1. There are no end points in a line.

2. There are no end points. So, length of a line cannot be measured.

3. The symbol of a line is

These explanations on line-segment, ray and line will help the kids to understand the different fundamental element of geometry and their distinction.

Related Concepts

Basic Shapes

Surfaces of the Solids

Common Solid Figures

Points, Lines and Shapes

Types of Lines

Geometrical Design and Models

3rd Grade Math Lessons

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