Introduce Dilations and Isometries

  1. Teach students to understand scale factors.
  2. Introduce key terms.
    Dilation
    Enlargement
    Reduction
  3. Provide exemplars, such as car models or apple seeds. 
  4. Students practice dilations using Sketchometry or Geometer’s Sketchpad

Tips and Tools

See this Dilations and Isometry lesson for ideas on teaching these topics.

Highlight Mathematical Practice 7, Look for and make use of structure, on the Mathematical Practices Rubric.

If time permits, have students brainstorm other dilations, then meet in triads and offer a one-minute presentation on why dilations matter.

Have students complete Daily Learning Logs

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