Grade 3 · Math · Lesson 27

Recognize Symmetry and Patterns

A shape has a line of symmetry if it can be folded exactly in half so both sides match perfectly. Shapes like squares, circles, and equilateral triangles have lines of symmetry. Some shapes — like a scalene triangle or the letter Z — have no line of symmetry because no fold makes both sides match.

What this lesson teaches

1Identify shapes that have lines of symmetry
2Distinguish between symmetrical and non-symmetrical shapes

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