Friday, October 24, 2008
Geometry (Class 21)
Lesson Title
Missing Angles Puzzles (2)
Overview
The warm-up for today is the last “Figure It Out!” problem for a while. These have been tough, but students have shown a lot of growth in identifying embedded shapes and determining the sum of their interior angles. The lesson for today will continue working with finding the missing angles in a figure using the theorems (rules) we have developed so far. Students also continue to work with recording the steps they followed to arrive at their conclusion through the use of flow charts. Finally, during the last 45 minutes of the class the students will be taking their fourth test for the year.
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 (#20)
Chapter 1- Lesson 3: Angles and their Measures Worksheet #7-10, 14, 15, 18-20, 25, 26, 30, 31, 39, 41, 42, 48, 51, 52
Handouts
No Handouts Posted
Assignment
Chapter 1- Lesson 3: Angles and their Measures Worksheet #33-36, 43-46, 53, 54
Model Drawing Problem: Distance and Midpoints 7
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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