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Basics of Symmetry

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Intros
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Lessons
  1. What is symmetry? What is a symmetrical shape?
  2. Folding test for lines of symmetry
  3. Mirror test for lines of symmetry
  4. Symmetry in alphabet letters and numbers
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Examples
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Lessons
  1. Congruent parts and lines of symmetry
    A dotted line breaks the shape into two parts.
    • Is it a line of symmetry?
    • Are the parts congruent?
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  2. Line of symmetry
    Draw a line of symmetry for the shape.
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  3. Multiple lines of symmetry
    Draw two possible lines of symmetry.
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  4. Symmetrical shapes on a dot grid
    Using the dot grid, finish drawing the shape. The line of symmetry and half of the shape are shown.
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  5. Symmetry of regular polygons
    1. For each regular polygon, draw all possible lines of symmetry and fill out your answers in the table.
      Basics of Symmetry
    2. Following the pattern for regular polygons, how many lines of symmetry would a heptagon have?
    3. Following the pattern for regular polygons, how many lines of symmetry would an octagon have?