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This lesson unit is intended to help teachers assess how well students are able to: work with concepts of congruency and similarity, including identifying corresponding sides and corresponding angles within and between triangles; Identify and understand the significance of a counter-example; Prove, and evaluate proofs in a geometric context.
Lower Primary, Upper Primary, Middle School, High School
Kindergarten, Grade 1, Grade 2, Grade 3, Grade 4, Grade 5, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, Grade 11, Grade 12
Material Type:
Assessment, Lesson Plan
Shell Center for Mathematical Education
Provider Set:
Mathematics Assessment Project (MAP)
Date Added:
Creative Commons Attribution Non-Commercial No Derivatives
Media Format:
Downloadable docs, Text/HTML


Anonymous on Jul 05, 11:15pm

Students work with concepts of congruency and similarity, by identifying corresponding sides and corresponding angles within and between triangles. They identify and understand the significance of an example and of counter-examples in the development of proofs. They evaluate proofs within a geometric context.

Authors suggest that unit covers G-SRT 4 and G-SRT 5. However the connections are not evident in lesson design.

Lesson plans provide instructional strategies along with sample questioning strategies to build student understanding. It also provides potential student misconceptions and questions designed to build understanding.

Instructional strategies build opportunities for students to utilize mathematical practices 3 and 7. Mathematical Practice 5 was rated as a level 1 because the current lesson design does not require students to determine appropriate / strategic use of available tools for the learning process (i.e., students are given tools to use).



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Average Score (3 Points Possible)
Degree of Alignment1.8 (1 user)
Quality of Explanation of the Subject Matter2 (1 user)
Utility of Materials Designed to Support Teaching3 (1 user)
Quality of AssessmentsN/A
Quality of Technological InteractivityN/A
Quality of Instructional and Practice ExercisesN/A
Opportunities for Deeper LearningN/A

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