| Lesson Plan Title/Info: | Lesson Plan - Unit 2 Lesson 18: Congruent Triangles (Congruent Triangles) Is Number 18 Of 20 In Unit Plan - Unit 2: Geometry in the Trees (Triangular Relationships) | ||||||||||||||
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| Creator: | Shelia Cain: scain@stratuswave.net | ||||||||||||||
| Subject: | Mathematics | ||||||||||||||
| Grade Level: | Geometry | ||||||||||||||
| Essential Questions: | How are congruent triangles and similar triangles the same and different? How are congruence relationships useful in everyday life? *Please see Lesson 18 Notes to the Teacher.
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| Launch/Introduction (suggested time 15-25 m): |
Introduce the lesson using the website: http://www.freemathhelp.com/Lessons/Geometry_Proving_Triangles_Congruent_BB.htm
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| Activating Prior Knowledge: | Teacher should lead classroom discussion to review similar triangles and corresponding parts.
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| Specialized Vocabulary Development: | Students will understand the meaning of congruent triangles, similar triangles, and corresponding parts after viewing several clips from the internet and doing several investigation activities.
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| Investigate/Explore (suggested time from 30-40 m): |
Investigate and explore properties of congruent triangles using the websites: http://www.yourteacher.com/free-video.php?id=3035 http://www.yourteacher.com/free-video.php?id=3037 Place students in collaborate groups and have them investigate conditions that make triangles congruent using the worksheets “A Patty Paper Investigation– SSS, AAA, SAS, ASA, AAS, and SSA” and “A CPCTC Investigation”. When finished, discuss findings as a class.
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| Summarize/Debrief the Lesson (suggested time from 30-40 m): |
Reinforce discovered relationships using the worksheet “Real World Congruent Triangles and Constructions.”
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| Reflection: | Compare and contrast congruent triangles and similar triangles. Discuss how congruence relationships are useful in everyday life. Assign Congruent Triangles and CPCTC Activities.
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| Materials: | Patty Paper, computer with internet access.
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| Duration: | At least one 90 minute period. | ||||||||||||||
| Files Uploaded |
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| Date Created: | February 11, 2008 | ||||||||||||||
| Date Modified: | August 08, 2008 |