Thursday, December 11, 2008
Geometry (Class 36)
Lesson Title
Proving Lines Parallel
Overview
Students solve student problems created last class concerning parallel lines and a “bent” transversal as their warm-up for the day. The lesson for the day focuses on how to prove lines parallel.
Textbook Sections
§3.4 (Txt. p.150) Proving Lines Parallel
Vocabulary
implication
deduction
syllogism
two-column proof
statement
reason
auxiliary line
Key Attitudes
Math is about being convinced a statement is always true.
Key Ideas
A converse of an If, then statement can be created by switching the position of the hypothesis (if) and conclusion (then).
Not all converses are true.
If an if, then statement and its converse are true, then the statement is a biconditional.
Key Skills
I can create and solve a problem involving parallel lines and a “bent” transversal.
I can prove lines parallel.
Turn-In (#35)
Txt. p.168 #26, 30-34, 36-38, 42, 43
Handouts
Chapter 3- Lesson 2: Proving Lines Parallel
Assignment
Txt. p.153 #10-18, 20-26
Disclaimer- The assignment as stated in class is the official assignment. Every effort is made to keep this posting accurate, but you should refer to what was stated in class as the final word.
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