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Transformations Unit - Reflections

Printable Version for your convenience!

Title - Transformations Unit - Reflections
By - Cornelia Taran
Primary Subject - Math
Grade Level - 9-12



Transformation Unit:
  • Lesson Plan 1 - Translations
  • Lesson Plan 2 - Reflections (below)
  • Lesson Plan 3 - Rotations


  • Lesson Plan 2: Reflections

    Content:
      The students will identify and locate reflections
    Benchmarks:
      G3.1: Distance-preserving transformations - isometries
    Learning Resources and Materials:
    • Transformation Tool
    • Navigation through Geometry, NCTM
    • Translucent paper
    • Pictures with reflections
    Development of Lesson:
      Introduction:

        Objectives:
          The students will identify and locate reflections

        Anticipatory Set:
          Show pictures of geometric patterns and asked the students to describe the patterns that they see.

        Lesson:
        • Explain that geometric patterns can be created using slides, flips, turns, and dilations, which are types of transformations.
        • A reflection can be seen in water or in a mirror. An object and its reflection have the same shape and size, but the opposite orientation.
        • Define: image, preimage and isometry.
        • Use translucent paper to create reflections.

      Methods/Procedures:
      1. Ask the students to draw a shape and a line on tracing paper. Draw a point on the line to use as a reference point.
      2. Place a second paper on top of the original, and trace the figure, the line and the point.
      3. Flip Sheet 2 over, and put it under the original. Align the lines of reflection and the reference points.
      4. Trace the image from Sheet 2 onto the original sheet. Label the original figure and the reflected figure.



      Accommodations/Adaptations:
        Allow working with a partner

      Assessment Evaluation:
        Formative - monitor and provide feedback.

      Closure:
        Draw a shape, a mirror line, and the image of the shape reflected across the mirror line.

    E-Mail Cornelia Taran !