.

2. What are the three types of lines we have
studied?
What’s the capital of Vietnam? (Just kidding,
we didn’t talk about that!)

3. •A transversal is a line that intersects with
two other lines.
•In this picture, which line is a transversal?

4. When we have a transversal line, there are
many angles created.
•How many angles are there?

5. •These angles are not the same.
•We use different words to describe them.

6. •We have interior angles.
•Interior is a fancy word for ‘inside’.
•These angles are ‘inside’ of the two parallel
lines.

7. •We have exterior angles.
•Exterior is a fancy word for ‘outside’.
•These angles are ‘outside’ of the two parallel
lines.

8. I know!
We are the best
angles!
E R
Hi, I’m interior
angle E.
Who are you?
Nice to meet you
interior angle E.
My name is interior
It’s nice and cool angle R .
here in the interior.
I’m glad I’m not an
exterior angle!

9. A M
Wow, it’s a beautiful day!
Hi, I’m exterior angle A.
?
I love being outside!
It’s great to be an
exterior angle. I’m
exterior angle M.
I know, I’m happy
that I’m not an
interior angle. It’s
too stuffy inside.
I know!
We are the best
angles!

10. •We have co-interior angles.
•These are two angle that have a special
relationship.
•These angles are interior AND on the same side of
the transversal line.
•The sum of their angles ALWAYS = 180 DEGREES

11. Ah ha!
Hmmm, I’m not
F
sure……..
I am 71 Degrees!
Hi interior angle F. We are co-interiors!
C
Does anyone else
I am 109 Degrees.
How big are you?
know?
?

12. Does other That’s anyone know the
pair right, of co-angles interior
D
and E.
angles?

13. •We have alternate interior angles.
•These are two angle that have a special
relationship.
•Both angles are inside the parallel lines and on
opposite (alternate) sides of the transversal.
•These angle will ALWAYS have the same measure.

14. F
Ah ha!
Hmmm, I’m not
sure……..
I am 71 Degrees!
D
Hi interior angle F. We are
alternate interior angles!
Does anyone else
I am 71 Degrees.
How big are you?
know?
?

15. Does other That’s anyone know the
pair right, of alternate
angles C
and E.
interior angles?

16. •We have alternate exterior angles.
•These are also two angle that have a special
relationship.
•Both angles are outside the parallel lines and on
opposite (alternate) sides of the transversal.
•These angle will ALWAYS have the same measure.

17. Hi exterior angle G. We
are Does alternate anyone exterior
else
buddies! degrees. know?
I measure 71
How about
you?
Ah ha!
Hmmm, I’m not
sure……..
I am 71 Degrees!
A G

18. Does other That’s anyone know the
pair right, of alternate
angles B
and H.
exterior angles?