Summary
Daniel introduces symmetry and lines of symmetry in 2D shapes and real-world objects. Covers reflective symmetry, how to test for it by folding, and examples in nature and design. A visual, engaging geometry lesson for grades 2–4.
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Teaching resources
Discussion questions
Discussion
A shape has a line of symmetry if you can fold it so both halves match exactly.
- How many lines of symmetry does a square have? A circle?
- Does the letter A have symmetry? What about R?
- Find 3 examples of symmetry in nature or your classroom.
Quick work-a-long
Vocabulary: symmetry, line of symmetry, reflection, mirror image, identical.
Try it: Fold a piece of paper in half and cut a shape while it's folded. Open it — you've made a symmetrical shape! Draw and label its line of symmetry.