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Lesson Plans and Worksheets for Grade 4

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Common Core For Grade 4

Videos, examples, solutions, and lessons to help Grade 4 students learn to 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.

Common Core: 4.G.3

### Suggested Learning Targets

**Line of Symmetry**

This video gives the definition of line symmetry and asks students to identify it within several images.
**Line Symmetry**

This video will review with you the basics of line symmetry

Line Symmetry - A figure has line symmetry if a line can be drawn through the figure so that each half is a mirror image of the other.

**Lines of Symmetry**

How to identify lines of symmetry in geometric figures?**Line Symmetry**

Line Symmetry: Common Core Standards, Geometry 4.G.3 The following activities are from the Howard County Public School System.

Activity 1:

Caitlin and Gerry had to draw symmetrical figures. Gerry drew the figure shown to the right and drew the dotted line through the figure. Garry said, “The dotted line is a line of symmetry.” Caitlin said, “The dotted line is not a line of symmetry.”**Lines of Symmetry**

In this lesson, we will find lines of symmetry in a diamond, a heart, and a sun.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

Lesson Plans and Worksheets for Grade 4

Lesson Plans and Worksheets for all Grades

More Lessons for Grade 4

Common Core For Grade 4

Common Core: 4.G.3

- I can identify shapes with symmetry.
- I can define symmetry.
- I can draw a line of symmetry.

This video gives the definition of line symmetry and asks students to identify it within several images.

This video will review with you the basics of line symmetry

Line Symmetry - A figure has line symmetry if a line can be drawn through the figure so that each half is a mirror image of the other.

How to identify lines of symmetry in geometric figures?

Line Symmetry: Common Core Standards, Geometry 4.G.3 The following activities are from the Howard County Public School System.

Activity 1:

Caitlin and Gerry had to draw symmetrical figures. Gerry drew the figure shown to the right and drew the dotted line through the figure. Garry said, “The dotted line is a line of symmetry.” Caitlin said, “The dotted line is not a line of symmetry.”

Who is correct? Caitlin or Gerry. Explain how you know that person’s statement is correct.

Activity 2:

Rosa and Steven were investigating quadrilaterals and symmetry in math class. Rosa drew the quadrilateral to

Rosa drew the quadrilateral and found four lines of symmetry as shown.

She looked at Steven and said, “That makes sense. A shape with four sides and four angles should have four lines of symmetry.”

Steven corrected Rosa, saying, “Not all four-sided shapes have four lines of symmetry.” Then, he drew a four-sided figure to support his statement. Draw a figure to show what Steven might have drawn.

**Lines of Symmetry**

How to find lines of symmetry?

In this lesson, we will find lines of symmetry in a diamond, a heart, and a sun.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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