Lesson 13, Yes you have more studying to do.

A B

Parallel LinesHow do we draw a line parallel to

line AB?Does anyone have an idea?

X

Y

A B

InstructionsDraw a line perpendicular to line ABLine XY is perpendicular to line AB

R S

X

Y

A B

InstructionsDraw another line, perpendicular to

line XY

Line RS is parallel to line AB

R S

X

Y

A B

Instructions

Instructions# 1On page # 36, use your protractor to

draw line that is parallel to this line.

Instructions# 2On page # 36, use your set square to

draw line that is parallel to this line.

Just do it.

C

D

A

B

What type of lines are these?

C

D

A

B

How do we classify parallel lines?

A

B

How do we classify parallel lines?

First, this line is written like this:

AB

How do we classify parallel lines?

Next, this line is written like this:

CD

C

D

This symbol means we have a straight line.

C

D

A

B

How do we classify parallel lines?

We classify parallellines using this symbol:

ll

C

D

A

B

How do we classify parallel lines?

So:

AB ll CD

What type of lines are these?

QT

SR

How do we classify intersecting lines?

QT

SR

Easy!

QT

SR

QR intersects ST

QT

SR

For intersecting lines, we simply write INTERSECTS

QT

SR

What type of lines are these?

V

R

D

A

How do we classify perpendicular lines?

V

R

D

A

DV AR

V

R

D

A

We use this symbol to classify perpendicular lines.

X

R

E

How do we classify lines that don’t intersect?

Y

X

R

E

Y

Easy!

This symbol means that the line goes on FOREVER!

X Y

X

R

E

Y

So you can use your ruler to make the line longer!

X

R

E

Y

Now we can classify our lines.

Practice TimeLet’s practice classifying lines on page

37If you don’t remember the symbols,

look at the board for help. I will write them for you.