Wednesday, January 16, 2008
Geometry (Class 43)
Announcements
We will not be having a test on Wednesday.
Lesson Title
Defining “Parallelogram” 1
Overview
In today’s class we finish the proofs involving the centroid of a triangle. In addition we move our focus to quadrilaterals. This study of four sided polygons begins by developing alternative definitions for “parallelogram”. By developing alternative definitions we uncover what information is necessary to infer that a given quadrilateral is, might be, or is not a parallelogram.
Textbook Sections
§6.1 (Txt. p.322) Polygons
§6.2 (Txt. p.330) Properties of Paralelograms
Vocabulary
quadrilateral
parallelogram
adjacent sides
adjacent angles
opposite sides
opposite angles
Key Attitudes
Math is about thinking creatively.
Key Ideas
A good definition captures the essential characteristics of what it is you are trying to define.
Key Skills
Proving conjectures regarding the centroid of a triangle.
Using the properties of the centroid of a triangle to determine lengths and areas.
Determining if given information is enough to determine if a quadrilateral is, might be, or is not a parallelogram.
Turn-In (#42)
Turn in #42
5.3 (Txt. p.283) #10, 20
Txt. p.314 #1-12
Handouts
Chapter 6- Lesson 1: Defining “Parallelogram”
Assignment
Txt. p. 388 #3-5,7-21
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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