Repeated Reflections and Rotations

Where did the triangle go? Given a triangle on a grid, pupils describe what happens to the image after successive transformations that consist of two sequential reflections and four rotations of 90 degrees.

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CCSS: Designed
Instructional Ideas

  • Create the figure in a dynamic geometry software for struggling learners to use
  • Lead a discussion with the class on what constitutes a valid description
Classroom Considerations

  • Class members should be familiar with reflections and rotations
Pros

  • Contains examples of work that highlights misconceptions
  • Includes questions for the teacher to ask to gain further understanding of individuals' thought processes
Cons

  • None
Common Core