NC.4.G.3
Recognize symmetry in a two-dimensional figure, and identify and draw lines of symmetry
Embedded Files
Step 1: Lesson Standards & Learning Goals
In this standard, students determine if figures are symmetrical, and if they are symmetrical how many lines of symmetry are in a figure. Students explore the concept that a line of symmetry is a line that divides a figure into two parts that are identical in shape and size. Students are expected to identify and draw lines of symmetry in regular and non-regular polygons, circles, and letters of the alphabet. Circles have an infinite number of lines of symmetry while all regular and non-regular polygons have a specific number of lines of symmetry. Students are expected to understand that some figures may have more than one line of symmetry. In Grade 4, students only explore line symmetry not rotational symmetry.
Sample Essential Questions
Sample Essential Questions
What is symmetry?
Why do some shapes have more than one line of symmetry?
How can lines of symmetry be recognized and drawn in two-dimensional figures?
Vocabulary
Vocabulary
Diagonal
Horizontal
Identical
Line of symmetry
Polygon
Symmetrical
Symmetry
Two-dimensional figure
Vertical
Students will be able to...
Students will be able to...
Understand that a line of symmetry divides a figure into two parts that are identical.
Determine if a figure is symmetrical.
Determine the number of lines of symmetry in a figure.
Identify and draw lines of symmetry in regular and non-regular polygons, circles, and letters of the alphabet.
Understand that some figures have more than one line of symmetry.
Students will know...
Students will know...
A line of symmetry divides a figure into two parts that are identical.
Some figures have only one line of symmetry while others have more than one.
Circles have an infinite number of lines of symmetry.
Lines of symmetry can be horizontal, vertical or diagonal.
Step 2: Assessment
Mastery Connect
Mastery Connect
NC.4.G.3 - CO - Howell - Mar. 8, 2023
NC.4 - Cluster 8 Review - CO - Howell - Mar. 6, 2023
NC.4 Benchmark Review Practice - CO - Howell - Mar. 31, 2023
Tools 4 NC Teachers
Tools 4 NC Teachers
Step 3: Lesson Instructions
Possible Activating Strategies
Possible Activating Strategies
Exploration or Experience
Give students a letter of the alphabet and challenge them to fold the letter to make two identical images. This standard refers to the traditional manuscript alphabet.
Video Clip
Read Aloud
Teacher Resources
Teacher Resources
Tools 4 NC Teachers
Cluster 8 Lessons
Math Expressions - (Barnes and Hearne) - Standards Alignment
Motivation Math
Think Up! Math
Khan Academy - 4th Grade Math
Eureka Math/Engage NY Free Resources
Embarc Online (Eureka Math) -
Zearn Math - Online Support Practice for Eureka Math (Requires free account)
Khan Academy Eureka Math Grade 4
North Carolina Collaborative for Mathematics Learning - Grade 4 Instructional Framework
NCDPI Resources
Thinking Blocks - Word Problem Practice with Bar Diagrams
YouTube Videos
Fact Practice
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