Lesson Plan

Lines of Symmetry for Triangles

This Lines of Symmetry for Triangles lesson plan also includes:

What can symmetry tell us about triangles? After looking at four examples, learners will come to realize that lines of symmetry are different for equilateral, isosceles, and scalene triangles. Use this guided practice activity as an introduction to classifying triangles based on their side lengths.

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CCSS: Designed
  • Includes examples of equilateral, isosceles, and scalene triangles
  • Triangles are labeled with side lengths to facilitate their classification
  • Triangles are a little small if you plan on cutting them out for students to fold
Common Core