Reflection: Developing a Conceptual Understanding Congruent Triangles Based on Rigid Motions - Section 4: Summary


Instead of collecting the Exit Ticket, we went over the question at the end of the lesson. My students were able to verbalize why a triangle and its image after a reflection over the y-axis are congruent; however, they had difficulty writing an explanation. Students often have difficulty applying mathematical vocabulary and writing a coherent explanation. I had them talk to each other first and then share out responses with the class. We came up with the explanation, "When a triangle is reflected over the y-axis, the pre-image and image will occupy the same space." Then we added, "The length of each of the corresponding sides will be the same." Although I may have answered the question differently myself, I thought it was important to use the students voice in answering the question.  I did remind them of vocabulary and added the word "occupy" to clarify the description.

  Congruent Triangles Based on Rigid Motions Summary Reflection
  Developing a Conceptual Understanding: Congruent Triangles Based on Rigid Motions Summary Reflection
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Congruent Triangles Based on Rigid Motions

Unit 4: Rigid Motions
Lesson 2 of 3

Objective: SWBAT Use rigid motions to decide if two triangles are congruent.

Big Idea: Students will examine triangles on the coordinate plane and use rigid motions to show two triangles are congruent.

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triangle congruence based on rigid motion image
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