How to draw parallel lines using, square, protractor or compass

1. Unit 2, Lesson 3

2. A B
Parallel Lines
How do we draw a line parallel to
line AB?
Does anyone have an idea?

3. X
Y
A B
Instructions
Draw a line perpendicular to line AB
Line XY is perpendicular to line AB

4. R S
X
Y
A B
Instructions
Draw another line, perpendicular to
line XY

5. Line RS is parallel to line AB
R S
X
Y
A B
Instructions

6. Instructions
# 1
On page # 23, use your protractor to
draw line that is parallel to this line.

7. Instructions
# 2
On page # 23, use your set square to
draw line that is parallel to this line.

8. Just do it.

9. C
D
A
B
What type of lines are these?
PARALLEL!

10. C
D
A
B
How do we classify
parallel lines?

11. A
B
How do we classify parallel
lines?
First, this line is written
like this:
AB

12. How do we classify parallel
lines?
Next, this line is written
like this:
CD
C
D

13. This symbol means we have a
straight line.

14. C
D
A
B
How do we classify parallel
lines?
We classify parallel
lines using this symbol:
ll

15. C
D
A
B
How do we classify parallel
lines?
So:
AB ll CD

16. What type of lines are these?
Q
T
S
R
INTERSECTING!

17. How do we classify intersecting
lines?
Q
T
S
R
It’s
Easy!

18. For intersecting lines, we
simply write INTERSECTS
Q
T
S
R

19. QR intersects ST
Q
T
S
R

20. What type of lines are these?
V
R
D
A
PERPENDICULAR

21. How do we classify perpendicular
lines?
V
R
D
A

22. We use this symbol to classify
perpendicular lines.

23. DV AR
V
R
D
A

24. X
R
E
How do we classify lines that
don’t intersect?
Y
It’s
Easy!

25. This symbol means that the line
goes on FOREVER!
X Y

26. X
R
E
Y
So you can use your ruler to
make the line longer!

27. X
R
E
Y
Now the lines are ready to
classify!
ER XY

28. MORE EXAMPLES!
A
B
C
D
AB CD
A
B
C
D
AB CDintersects

29. Practice Time
Let’s practice classifying lines on page
24
Answer with SYMBOLS ( , )
If you don’t remember the symbols,
look at the board for help. I will write
them for you.
Remember that “intersects” has no
symbol!