1. Line,
line segment and rays

2. l Line is a straight path and extends in both direction without end
A line through two point A and B is written as
Also it is denoted by letter l
Since line has not end points we cannot find its length.
The following are not lines since they have not straight path AB
or BA

3. Example :- Identify the lines from the figure
We can see 3 lines from the figure
Line L1
Line L2
Line L3
or AB
or BA
or CD
or DC
or PQ
or QP

4. Line segment is a line that ends at both side.
We use capital letter to denote end of line segment.
In the above figure the line segment has two end point A and B.
A line segment with end points A and B is written as
Since line segment has end points, we can measure its length AB
or BA

5. Example :- Identify the line segment from the figure
We can see 4 line segments from the figure
Line AB
or BA BD
or DB CD
or DC AC
or CA

6. A ray with end point A and passes through point B is written as
Rays is a line that ends at one side and extends at other side without end. A B
A ray with end point A and passes through point B is written as
Since ray does not have two end point, it length cannot be measured. AB

7. Example :- Identify rays from the figure
We can see 3 rays from the figure
Ray OA OB OC

8. Try these
Identify line, line segment and rays from the figure