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Lesson Plan

8. Create lines of symmetry (FP)

teaches Common Core State Standards CCSS.Math.Content.4.G.A.3
teaches Common Core State Standards CCSS.Math.Practice.MP2
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Lesson objective: Divide two-dimensional figures in half using a line of symmetry. 

This lesson helps to build fluency with finding lines of symmetry in two-dimensional fugures. Mirrors are used here because it highlights that a line of symmetry creates mirror images. This work develops students' understanding that a ine of symmetry is a line that divides a figure into two congruent figures that are mirror images of each other.

Students engage in Mathematical Practice 2 (reason abstractly and quantitatively) as they determine whether a figure is divided equally in two parts. Mirrors are used to help students visualize how a line of symmetry creates a mirror image.

Key vocabulary:

  • equal
  • line of symmetry
  • symmetrical
  • symmetry

Special materials needed:

  • mirror (optional)
Related content

Appears in

Recognizing and analyzing attributes of 2-dimensional shapes

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