1. Lines, rays and line segments

2. lines = straight lines can be extended both ways
Can you measure its length?

3. rays can be extended one way other end fixed
Can you measure its length?

4. line segments How many line segments? both ends fixed Any more?
Can you measure its length?

5. line
What can you call this line? A B C AB BC AC

6. rays
Which rays have 2 names?
How many rays? A B C AB BA BC CB AC CA

7. line segments
How many line segments? A B C AB BC AC

8. line segments A B C
4 cm
3 cm + =
7 cm AB + BC = AC

9. line, rays and line segmentPQ P Q PQ PQ QP