# Ch 22: 4th Grade Math: Symmetry, Similarity & Congruence

### About This Chapter

## 4th Grade Math: Symmetry, Similarity & Congruence - Chapter Summary

Would you like to explain geometry in a way your students won't forget? The funny and age appropriate video lessons in this chapter teach 4th graders about symmetry, similarity, congruence, perpendicular lines, transverse points and more using practical, real-world examples. You can see how well your students have retained the information by using the short, multiple-choice quizzes and a chapter exam.

## Chapter Lessons and Objectives

Lesson | Objective |
---|---|

The Line of Symmetry in Geometric Shapes | Students learn to recognize the line of symmetry in a triangle, rectangle, square and parallelogram. |

Congruence in Geometric Shapes | Instructors explain what it means for shapes to be congruent and then test several shapes' congruency. |

Similarity in Geometric Shapes | In this lesson, students learn what makes shapes similar. |

Parallel, Perpendicular and Transverse Lines | The lesson explains parallel, perpendicular and transversal lines. |

Identifying Parallel Lines in Geometric Shapes | Students look for parallel lines in rectangles, squares and parallelograms. |

Constructing Perpendicular Lines in Geometry | Instructors show how to construct perpendicular lines. |

Identifying Perpendicular Lines in Geometric Shapes | Students examine triangles, rectangles, squares and trapezoids for perpendicular lines. |

Reflection, Rotation & Translation | Students explore the definitions of reflection, rotation and translation and ways to identify them. |

Reflecting Simple Shapes in a Mirror Line | With this lesson, students use a mirror to reflect simple shapes. |

Line and Rotational Symmetries of 2D Shapes | The lesson leads students to recognize all the line and rotational symmetries of 2D shapes. |

### 1. Parallel, Perpendicular and Transverse Lines

What are the different types of lines? Where are they visible in the real world and how can you recognize them? Find out here and test your knowledge with a quiz.

### 2. Constructing Perpendicular Lines in Geometry

In this video lesson, you will see how to use geometric construction to draw perpendicular lines. Learn why geometric construction is useful. Also find out the only two tools in addition to your pencil that you need to do this.

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### Other Chapters

Other chapters within the 4th Grade Math: Practice & Review course

- 4th Grade Math: Number Sense & Arithmetic
- 4th Grade Math: Number Properties
- 4th Grade Math: Solving Math Word Problems
- 4th Grade Math: Estimation & Rounding
- 4th Grade Math: Addition
- 4th Grade Math: Subtraction
- 4th Grade Math: Multiplication
- 4th Grade Math: Multiples of Whole Numbers
- 4th Grade Math: Division
- 4th Grade Math: Simplifying Whole Number Expressions
- 4th Grade Math: Basic Algebraic Expressions
- 4th Grade Math: Data & Graphs
- 4th Grade Math: Probability & Statistics
- 4th Grade Math: Units of Measurement
- 4th Grade Math: Introduction to Geometric Figures
- 4th Grade Math: Angles
- 4th Grade Math: Triangles
- 4th Grade Math: Quadrilaterals
- 4th Grade Math: Circles
- 4th Grade Math: Polyhedrons & Geometric Solids
- 4th Grade Math: Perimeter, Area & Volume
- 4th Grade Math: Fractions
- 4th Grade Math: Operations with Fractions
- 4th Grade Math: Decimals
- 4th Grade Math: Operations with Decimals
- 4th Grade Math: Money
- 4th Grade Math: Time
- 4th Grade Math: The Coordinate Graph
- 4th Grade Math: Patterns & Sequences