Thursday, October 30, 2008
Geometry (Class 23)
Lesson Title
Missing Angles Puzzles (4)
Overview
The warm-up today continues the theme of fitting the proper units of measure to a story. We also continue with Model Drawing Problems -Distance and Midpoints 9. The lesson for the day works towards students developing the ability to see angle relationships in a drawing, to use these relationships to find missing angle measures, and then to sequence and record the steps they used to find the measure of a specific angle. All of this is background work intended to smooth the transition to the writing of formal two column proofs.
Textbook Sections
N/A
Vocabulary
acute angle
obtuse angle
right angle
straight angle
supplementary angles
complementary angles
adjacent angles
bisect
deduce, deduction
counter example
congruent
Key Attitudes
Math is about thinking creatively.
Key Ideas
A proof is the sequence of reasons which, when put together, compels you to believe something.
Key Skills
I can deduce the measure of angles.
I can state the steps I use to come to a conclusion.
I can record the steps I used to come to a conclusion in written form.
I can use the concept of a counter example to show that something is not necessarily true.
Turn-In (#22)
Test Corrections
Txt. p. 796 #1-3
Txt. p.39 #28-30, 40-42, 47-49
Handouts
No Handouts Posted
Assignment
Txt. p. 796 #4,5
Txt. p.47 #8-10, 14-16, 20-24, 28-30
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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