# Symmetry Lesson Plan

Instructor: Joanne Abramson

Joanne has taught middle school and high school science for more than ten years and has a master's degree in education.

This lesson plan will help you introduce middle school students to the concept of symmetry. A short video and several hands-on activities help students visualize reflection symmetry, rotational symmetry and point symmetry.

## Learning Objectives:

By the end of this lesson, students will be able to:

• name and recognize the three different types of symmetry: reflection, rotational, and point
• identify a shape's line of symmetry
• identify a shape's order of rotation
• create an image with point symmetry using graph paper

1-1.5 hours

## Materials

• Copies of the quiz that accompanies the video lesson
• Construction paper with various polygons printed on it, one for each student
• Shapes should include an equilateral triangle, isosceles triangle, scalene triangle, square, rectangle, parallelogram, rhombus, pentagon, and hexagon
• 8.5 x 11 inch sheets of graph paper, folded or marked to show the four quadrants
• 8.5 x 11 inch sheets of white paper
• Scissors
• Pencils

## Curriculum Standards

• CCSS.MATH.CONTENT.8.G.A.2

Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them.

• CCSS.MATH.CONTENT.8.G.A.3

Describe the effect of dilations, translations, rotations, and reflections on two-dimensional figures using coordinates.

## Key Terms

• Symmetry
• Asymmetric
• Line symmetry
• Line of symmetry
• Rotational symmetry
• Order
• Point symmetry

## Instructions

• Watch the video What is Symmetry in Math? - Definition & Concept. Have students take notes on important vocabulary terms, pausing as necessary to answer questions and clarity concepts.
• After the video, review the vocabulary terms with the class.
• Hand out copies of the quiz that accompanies the video. Have students work in pairs to complete the quiz.

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