Standard

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.

Resources

Videos

• Khan Academy (scroll to find 4.G.3 - click on a skill)
  • Videos (on left side in each skill)
• Learn Zillion
  • Videos

EngageNY Lessons

• Module 4, Topic D, Lesson 12: Recognize lines of symmetry for given two-dimensional figures; identify line-symmetric figures and draw lines of symmetry.
• Module 4, Topic D, Lesson 14: Define and construct triangles from given criteria. Explore symmetry in triangles.

Extra Practice

• North Carolina Tasks
• Illustrative Math Tasks
• Howard County Tasks
  • Click on 4th grade at bottom, then 4.G.3
  • Common Core Sheets

Released Assessment Questions

PARCC

4.G.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.

STUDENT SAMPLE RESPONSE

Performance Indicators: 4.G.3

Level 5: Exceeds Expectations

• Draws and identifies points, lines, line segments, rays, angles (right, obtuse and acute), perpendicular lines, parallel lines, lines of symmetry and right triangles, and use any of these to classify or describe two-dimensional figures.

Level 4: Meets Expectations

• Draws and identifies points, lines, line segments, rays, angles (right, obtuse and acute), perpendicular lines, parallel lines, lines of symmetry and right triangles, and use some of these to classify two-dimensional figures.

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