Wednesday, December 17, 2008
Geometry (Class 38)
Announcements
Test Wed. 12/17 focusing on proving lines parallel.
Lesson Title
Constructions 1
Overview
During the warm-up today students are introduced to constructions using a straight edge and compass. Detailed instructions for making these constructions can be found at the Math Open Reference. As time permits, students will have another opportunity to improve their skills of writing proofs to show that lines are parallel. Finally, students will take Test 7 focusing on proving 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 (#37)
Txt. p.154 #27, 28, 34, 35
Txt. p. 160 #11, 12, 15, 16, 18, 19, 21, 22
Handouts
Constructions 1
Assignment
Constructions 1 #TBA
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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