Theory:

A line segment:
A line segment has two endpoints, thus making it possible to get measured with a ruler.
How do you think a line segment would get constructed?
 
A line segment can be constructed in two ways.
 
1. By using rulers and compasses
 
2. By copying an existing line segment
 
In this section, let us learn to construct a line segment using rulers and compasses.
Construction of a line segment using rulers and compasses
Step \(1\): Place the ruler on the empty sheet of paper.
 
ruler_2.png
 
Step \(2\): Draw a line of any measurement.
 
measure_1_1.png
 
Step \(3\): Place the pointy end of a compass next to the \(0\) mark of the ruler and place the pencil end next to the desired number. For example, to construct a line segment of \(5 cm\) in length, place the pointy end of the compass next to the \(0\) mark and place the pencil end of the compass next to the number \(5\).
 
measure_2.png
 
Step \(4\): Keeping the measurement intact, place the pointy end of the compass on any point on the line and draw an arc with the pencil end over the line.
 
measure_3_1.png
 
Step \(5\): The point on the line where the pointy end was placed becomes one end of the line segment, while the point where the arc and the line meets becomes the other end of the line segment.
 
draw_1.png
 
In the figure given above, \(\overline{\rm AB}\) is formed using rulers and compasses.
 
If the arc does not fall over the line segment, keep extending the line until it meets the arc at some point.
 
Important!
What is the difference between a line and a line segment?
 
A line has no ending points, whereas a line segment has both starting and ending points.