Wednesday, February 13, 2008
Geometry (Class 51)
Lesson Title
What is “similarity”?
Overview
In today’s class our warm-up focuses on analyzing, editing, and evaluating two proofs written by “students”. During the lesson we share and validate area formulas the students derived for the areas of polygons. For homework students will apply these formulas to various situations. We then turn our attention to the next section of work which focus on “similarity”. We begin by investigating what is meant when we say that two triangles are similar.
Textbook Sections
§8.3 (Txt. p.473) Similar Polygons
Vocabulary
diagonal
bisect
vertex
opposite angle
opposite side
adjacent angle
adjacent side
attributes
similar, similarity
Key Attitudes
Math is about thinking creatively.
Key Ideas
A formulas for the area of a quadrilateral can be created by breaking the quadrilateral into triangles.
If two shapes look the same but are not necessarily the same size, we say that the shapes are similar.
All similar shapes share important attributes.
Key Skills
Be able to find the area of any quadrilateral.
Create similar triangles from given information.
Describe the attributes of similar shapes.
Turn-In (#50)
Turn in #50
Finish Chapter 6: Lesson 4
Handouts
Chapter 6- Lesson 7: Analyzing Proofs
Chapter 8- Lesson 1: “Similarity"- What does it mean?
Chapter 8- Lesson 2: Shortcuts to Similarity
Assignment
§6.7 (Txt. p.376) 14-18, 35-38, 41, 42, 50, 51
Test Corrections
Finish Chapter 8- Lesson 1: “Similar”- What does it mean?
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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