Definition of in Linesegment, ray and line geometry:
The part of a line is called a linesegment as shown below.
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.
Line AB 

Ray: We know about sunrays. A sunray 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.
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 (1D) figures as they have only length.
Distinction between linesegment, ray and line:
Linesegment 1. It has two end points. 2. The length of a linesegment is definite. So, it can be measured. 3. The symbol of a linesegment is _____ 
Ray 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 → 
Line 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 linesegment, ray and line will help the kids to understand the different fundamental element of geometry and their distinction.
Related Concepts
● Geometrical Design and Models
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