1. Geom2­3hour3.notebook September 13, 2011
Please be in your seat working on the
BELL WORK when the bell rings.
Thank you!
BELL WORK:
M
m BAM = (x+14)0
Find m MAX.
B A X
Agenda for today:
• calculator check
• questions on p.69 homework
• finish 2.2
• discuss 2.3
• 2.3 activity
• Work on homework! You may work with a partner.
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2. Geom2­3hour3.notebook September 13, 2011
Questions on p.69 homework?
By the end of class today, you should be able to:
1. Find measures of complementary and supplementary angles
using algebra (2.2).
2. Prove your own conclusions from given information (2.3).
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3. Geom2­3hour3.notebook September 13, 2011
2.2 continued ­ Interpret the sentences as algebra, then solve.
The measure of one of two complementary angles is three greater
than twice the measure of the other. Find the measure of each
The measure of the supplement of an angle is 60 less than 3
times the measure of the complement of the angle. Find the
measure of the complement.
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4. Geom2­3hour3.notebook September 13, 2011
2.3 ­ Drawing Conclusions
Example: C
Given: AB bisects CAD B
D
A
What is a logical conclusion that we could prove?
Example:
Given: A is a right angle
B is a right angle
What is a logical conclusion that we could prove?
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5. Geom2­3hour3.notebook September 13, 2011
2.3 Activity:
1. Get into groups of 3­4.
2. On one piece of paper, draw logical conclusions and PROVE
using a 2­column proof #3,5,7 on p.74.
3. When you are finished, please turn in your work. Make sure all
group members names are on it.
4. Begin your homework.
5. Please stay in a seat until the bell rings. Thank you!
HOMEWORK: p. 69 and 70 #5,10,11,16,19,23
p. 74 #2,6,8
Due Thursday
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