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Geom3.2.notebook
Geometry
Ch.3 Notes Page 7
P7 3­2 Proving Lines Parallel
August 28, 2014
Angle Relationships
corresponding angles are ___________________
alternate interior angles are _________________
same­side interior angles ____________________
alternate exterior angles are __________________
same­side exterior angles ____________________
Jan 21­1:45 PM
What is the converse?
conditional:
If two lines are parallel, then corresponding angles are congruent.
converse:
If the ______________________ are ___________, then the two lines are ______________________.
Jan 21­1:45 PM
Jan 23­10:34 AM
What is the converse?
conditional:
If two lines are parallel, then alternate interior angles are congruent.
converse:
If the ______________________ are ___________, then the two lines are ______________________.
Jan 21­1:45 PM
What is the converse?
conditional:
If two lines are parallel, then same­side interior angles add up to 1800.
converse:
If the ___________________________ add up to ______, then the two lines are ______________________.
Jan 21­1:45 PM
Jan 21­1:51 PM
1
Geom3.2.notebook
August 28, 2014
What is the converse?
conditional:
If two lines are parallel, then alternate exterior angles are congruent.
converse:
If the ______________________ are ___________, then the two lines are ______________________.
Jan 21­1:51 PM
Jan 21­1:53 PM
What is the converse?
conditional:
If two lines are parallel, then same­side exterior angles = 1800.
converse:
If the ______________________ are ___________, then the two lines are ______________________.
Jan 21­1:53 PM
Jan 21­1:55 PM
Converse Postulates or Theorems
1.
2.
3.
4.
5.
Jan 21­1:55 PM
Jan 27­8:33 AM
2
Geom3.2.notebook
August 28, 2014
2.
1.
Why are these lines parallel?
Converses of...
115
65
60
70
60
4.
3.
52
128
52
6.
5.
125
125
45
Jan 21­2:57 PM
7.
45
Jan 26­10:11 AM
8.
9.
10.
None
Unless angle 2 and 3 are both 90.
11.
12.
Jan 26­3:50 PM
Jan 21­3:10 PM
Jan 21­3:10 PM
Jan 21­3:10 PM
3
Geom3.2.notebook
August 28, 2014
HW #7
3­2 P137 #1­8,10­12,14­21,25,26,28
Terms:
No New Terms
Jan 21­1:47 PM
Jan 22­9:20 AM
Jan 21­1:58 PM
Jan 22­9:20 AM
Jan 21­1:59 PM
4
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