Chapter 3 Section 1
Properties of Parallel Lines
5
6
1
2
7 3
8 4
5 1
2
6
7 3
8 4
Same-Side Interior Angles
5 1
6 2
7 3
8 4
Lines m and n are
parallel.
5
1
6
m
2
7
3
8
n
4
1. List the pairs of corresponding angles
2. List the pairs of same-side interior angles
3. List the pairs of alternate interior angles
4. List the pairs of vertical angles
Put your piece of parchment paper on top of your
drawing and trace the drawing exactly so you can put
them on top of each other and compare.
5. Pick one pair of corresponding angles and lay them on top of
each other. What do you notice?
Will that work with a second pair of corresponding
angles?
6. Repeat #5 with a pair of alternate-interior angles
7. Pick one pair of same-side interior angles and put them up
next two each other so they are adjacent. What do you notice?



Corresponding Angles Postulate: If two parallel
lines are intersected by a transversal, then
corresponding angles are equal in measure
Alternate Interior Angles Theorem: If two parallel
lines are intersected by a transversal, then
alternate interior angles are equal in measure
Same-Side Interior Angles Theorem: If two parallel
lines are intersected by a transversal, then sameside interior angles are supplementary
5 1
6 2
7 3
8
4
5
1
6 2
7 3
8
4


Alternate Exterior Angles Theorem: If two parallel
lines are intersected by a transversal, then
alternate exterior angles are equal in measure
Same-Side Exterior Angles Theorem: If two parallel
lines are intersected by a transversal, then sameside exterior angles are supplementary
 Page
131 #5-7, 9, 11-16,
26, 30
Bring in your notebook!!!!