Friday, November 30, 2007
Geometry (Class 32)
Overview
In today’s class we take Test 5 which focuses on classes 25-31 whose main focus was using congruent triangles as tools for proving other facts, proving right triangles congruent using the Leg-Leg Theorem or the Hypotenuse-Leg Theorem. After the test, as time permits, we take a look at using another approach for proving theorems-- Proof by Contradiction (Indirect Proof)
Textbook Sections
§4.6 (Txt. p.236) Isosceles, Equilateral, and Right Triangles
§5.0 (Not in Text) Locus of Points
Key Attitudes
Math is about reasoning and justifying.
Key Ideas
Right triangles can be proved congruent using either the Leg-Leg Theorem or the Hypotenuse-Leg Theorem.
A figure can be thought of as a collection of points that meet a given set of requirements. This is called a “locus” of points.
Key Skills
Deciding if two triangles can be proved congruent from the given information.
Identifying which triangle congruence postulate can be used to prove triangles congruent.
Proving triangles congruent using HL or LL.
Constructing right trinagles.
Turn-In (#31)
Algebra & Geometry 5.5 (Optional)
Algebra & Geometry 6
§4.6 (Txt. p.239) #8, 9, 11-13, 17, 18, 20, 21, 33, 34
Handouts
Chapter 4- Lesson 6: Proof By Contradiction
Warm-Up 11/30
Assignment
§4.7 (Txt. p.247) #6-19
§4.6 (Txt. p.239) #10, 14-16, 19, 22, 23
Finish Chapter 4- Lesson 5: Proving Right Triangles Congruent
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.
Permalink