Lesson 5: Congruent Triangles - Bureau of Indian Education

Lesson 5: Congruent Triangles

Week of May 4, 2020

Note: This lesson plan goes with Geometry_Lesson5_Ch4Reteaching.pdf

Objectives:

? 4-1: To recognize congruent figures and their corresponding parts. ? 4-2: To prove two triangles are congruent using the SSS and SAS

postulates. ? 4-3: To prove two triangles are congruent using the ASA Postulate

and the AAS Theorem. ? 4-4: To use triangle congruence (SSS, SAS, ASA, and AAS) and CPCTC

to prove that the parts of two triangles are congruent. ? 4-5: To use and apply properties of isosceles triangles. ? 4-6: To prove triangles are congruent by the HL Theorem. ? 4-7: To prove triangles are congruent by first proving two other

triangles are congruent.

Materials:

Worksheet file name is: Geometry_Lesson5_Ch4Reteaching.pdf

Worksheet 4-1 Worksheet 4-2 Worksheet 4-3 Worksheet 4-4 Worksheet 4-5 Worksheet 4-6 Worksheet 4-7

Triangles

Congruent Figures Triangle Congruence by SSS and SAS Triangle Congruence by ASA and AAS Using Congruent Triangles: CPCTC Isosceles and Equilateral Triangles Congruence Right Triangles Using Corresponding Parts of Congruent

Procedures

A. Define the Congruent Triangles Vocabulary 4-1 corresponding angles, corresponding sides, congruent polygons 4-2 triangle, rigidity, included angle 4-3 included side 4-4 CPCTC

4-5 legs of an isosceles triangle, base of an isosceles triangle, vertex angle of an isosceles triangle, base angles of an isosceles triangle, corollary 4-6 hypotenuse, legs of a right triangle 4-7 overlapping triangles

B. Watch the YouTube videos on Triangle Congruent at . 1. Go to geometry 2. Click on Geometry ? Online Tutoring, Homework Help, Homeschooling ? 3. Now you are at Complete Online Geometry Course 4. Scroll down to the heading Parallel lines and polygons a. Click & Study 28 ? Triangle Vocabulary and Triangle Sum Theorem b. Click & Study 29? Advanced Triangle Sum Theorem 5. Scroll down to the heading Triangles a. Click & Study/Review 34 ? 38

c. Complete the Chapter 4 Reteaching Worksheets. d. Email your work to the instructor.

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