Recognize a line of symmetry for a two-dimensional figure

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Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
Guided Notes →One page your students fill in and keep.
Exit Ticket →Three items at the end of class. No student accounts.
Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
Homework →Assign practice; it grades itself.

4.G.A.3

**4.G.A.3**: Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.

4.G.A.3: Recognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts. Identify line-symmetric figures and draw lines of symmetry.

What you'll learn

Define a line of symmetry as a line across a two-dimensional figure such that the figure can be folded along the line into two matching parts
Identify whether a given two-dimensional figure has line symmetry
Draw all lines of symmetry for common two-dimensional figures (rectangles, squares, regular polygons, circles, letters, and real-world shapes)
Recognize that some figures have no lines of symmetry, some have exactly one, and some have multiple lines of symmetry
Distinguish a line of symmetry from a line that merely divides a figure into two equal-area parts but does not produce matching (mirror-image) halves

Review first:

Draw points, lines, line segments, rays, angles, and perpendicular and parallel lines

Slides

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Lines of symmetry

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Practice

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Exercise

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