Wednesday, October 22, 2008
Geometry (Class 20)
Lesson Title
Missing Angles Puzzles (2)
Overview
The warm-up today gives students another opportunity to work with the sum of the interior angles of polygons as well as improve their ability to see overlapping shapes in a figure (this is especially helpful for proofs we will be working with later in the year). The model drawing problem today involves distances, midpoints, equations of lines, and altitudes of triangles!
Also during class today students have the chance to review material concerning angle measures. And finally we will continue working with the new material concerning finding the measures of missing angles and recording the process we used to find a given measure.
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 (#19)
Chapter 1- Lesson 3
Txt. p.39 #17-20, 25-27, 37-39, 44-46
Handouts
Chapter 1- Lesson 3- Angles and their Measures Practice
Assignment
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
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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