Digital Skills: Developing Online Assessment Skills in Everyday Classroom Activities Western Reserve Public Media

Congruence Through Transformations
Students will explore how to prove objects congruent through a series of transformations

I can:
  • I can show objects congruent through a series of transformations
Tech Skills:
  • Students will learn use coordinate drag, rotation, and reflections tools on the coordinate grid

Materials and Resources:

Students will need computers or tablets

Transformation links for supporting tools



Congruence and transformations

Grade Level:
  • 8th Grade
Subject Area:
  • Math

Activity 1

  1. Bellringer: Use this time to assess student prior knowledge. I usually put three transformations on the board and the students need to determine which is a reflection, rotation, and translation.

  2. After the bellringer, review with the students the concept of congruence and any transformations that need reviewed. Make this a quick 5-10 minute review concept either on the smartboard or whatever you have available

  3. To help the students work with the graphing tools, let the student work through a couple problems in each section. These tools will be used in the next activity.

    Use The Khan academy links below:



  4. Let the students work through the sections. Make sure you are available to the students for clarification of the concepts and technology.



Activity 2

  1. Let the students explore the links for about 15-20 minutes.

  2. Bring the group together and discuss how the transformation tools could be used to string transformations together to prove objects congruent. Demonstrate with the link the will use Congruence and transformations

  3. After a 5-10 minute discussion allow the students time to work on the skill above. Again link this to your website, google classroom, or assign on Khan academy dashboard.

  4. Let the students work and you circulate for clarification.

  5. Do summary discussion to close the lesson.



Practice Activity

Depending on student mastery. Allow the students to finish the skills. If the completed the activity direct the student to a paper pencil exercise of your choice for extension to the concept


8.G.2 Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them. (Include examples both with and without coordinates.)

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