1. Geom2­4hour3.notebook September 20, 2011
Please have your definition log (assignment from
yesterday) on your desk so that I can look at it while you
do your bell work.
Thank you!
BELL WORK:
Read the definition of complementary angles
carefully from either your definition log or p.66
of the book.
Are 1, 2, and 3 complementary angles?
Why or why not?
Agenda for the day:
• Present 2.4
• Pass back quiz and go over
• exit slip
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2. Geom2­4hour3.notebook September 20, 2011
By the end of class, you will be able
to utilize FOUR new theorems to
complete 2­column proofs.
BELL WORK: p.79 #5
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3. Geom2­4hour3.notebook September 20, 2011
Agenda for the day:
• review/finish 2.4
• in­class homework quiz
• exit slip
1
700 2
A
Given: 1 is supplementary to A.
2 is supplementary to A.
Can we come to any conclusions?
Theorem: If angles are supplementary to the same angle,
then they are congruent.
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4. Geom2­4hour3.notebook September 20, 2011
A
Z
8
Given: 8 is complementary to A.
Z is complementary to A.
Can we come to any conclusions?
Theorem: If angles are complementary to the same angle,
then they are congruent.
S
B
Given: B is supp. to V.
V D is supp. to S.
V S.
D
Can we come to any conclusions?
Theorem: If angles are supplementary to congruent
angles, then they are congruent.
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5. Geom2­4hour3.notebook September 20, 2011
V
D Given: B is comp. to V.
D is comp. to S.
V S.
B
S
Can we come to any conclusions?
Theorem: If angles are complementary to congruent
angles, then they are congruent.
Given:
Conclusion: 1 2 3 4
5

6. Geom2­4hour3.notebook September 20, 2011
A
Given: D
B C
Conclusion:
H G
Given:
F
E J
Conclusion:
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7. Geom2­4hour3.notebook September 20, 2011
Given:
K R P
Conclusion:
M O
p.79 #7
K J
Given:
Conclusion: F H
G
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8. Geom2­4hour3.notebook September 20, 2011
1)
2)
3)
4)
IN­CLASS HOMEWORK QUIZ:
You may use your notes and book. You may use a partner.
Complete the following problems and turn in by the end of the hour:
p.79 #1,2,4,6,8
For #6, just provide a conclusion. You DO NOT need to prove.
EXIT SLIP:
Did you go to the Pumpkin Festival? If so, what was your
favorite part? Did you work any booths or tents?
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