# Ch 39: WEST Middle Grades Math: Symmetry, Similarity & Congruence

### About This Chapter

## WEST Middle Grades Math: Symmetry, Similarity & Congruence - Chapter Summary

Study the geometric concepts of symmetry, similarity and congruence by viewing these quick, thorough videos and taking the practice quiz after each. This chapter will help you master the concepts you'll likely see on your WEST Middle Grades Math test, such as:

- Lines of symmetry in different shapes
- Congruence in different shapes
- Similarity between shapes
- Construction and identification of line types

Use the video transcripts for additional review- they point out the key terms and ideas from the lessons. Reach out to our instructors any time you get stuck or confused.

### 1. What is a Line of Symmetry in Geometric Shapes?

In geometry, a line of symmetry in geometric shapes refers to the line that can divide the shape into two, so that each half reflects a mirror image of the other side. Learn more about geometric shapes and lines of symmetry, and then look at an example of a rectangle and an example of the letter 'A.'

### 2. Congruence in Geometric Shapes

In geometry, congruence refers to two concepts being perfectly identical. See how congruence is determined and appears in objects through examples of congruent and incongruent shapes.

### 3. Similarity in Geometric Shapes

Geometric figures can be called similar figures if their shapes are the same regardless of size. Learn about geometric shapes, the definition of similar shapes, and how to test and compare for similarity.

### 4. Parallel, Perpendicular and Transverse Lines

Lines have a specific shape, but there are different types of them according to how they relate to other lines in the same plane. Learn about the different types of lines, including parallel, perpendicular, and transverse lines, and see the formulas you can use to determine the type of line.

### 5. Identifying Parallel Lines in Geometric Shapes

A pair of lines in a geometric shape that does not intersect even if extended are called parallel lines. Learn more about parallel lines and how to identify them in geometric shapes, such as squares, rectangles, and parallelograms.

### 6. Constructing Perpendicular Lines in Geometry

In geometry, it is important to understand and know how to construct perpendicular lines. Learn what perpendicular lines are and discover their geometric construction, their set-up, and their construction process.

### 7. Identifying Perpendicular Lines in Geometric Shapes

Perpendicular lines are present in several geometric shapes and can be identified by the right angle formed between the lines. Learn about perpendicular lines and how to identify them in triangles, squares, rectangles, and trapezoids.

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### Other Chapters

Other chapters within the WEST Middle Grades Mathematics (203): Practice & Study Guide course

- WEST Middle Grades Math: Basic Arithmetic Operations
- WEST Middle Grades Math: Solving Math Word Problems
- WEST Middle Grades Math: Properties of Numbers
- WEST Middle Grades Math: Estimating & Rounding
- WEST Middle Grades Math: Number Theory
- WEST Middle Grades Math: Roots & Radical Expressions
- WEST Middle Grades Math: Exponents & Exponential Expressions
- WEST Middle Grades Math: Scientific Notation
- WEST Middle Grades Math: Simplifying Whole Number Expressions
- WEST Middle Grades Math: Integers
- WEST Middle Grades Math: Rational Numbers
- WEST Middle Grades Math: Introduction to Fractions
- WEST Middle Grades Math: Operations with Fractions
- WEST Middle Grades Math: Introduction to Decimals
- WEST Middle Grades Math: Operations with Decimals
- WEST Middle Grades Math: Percents
- WEST Middle Grades Math: Money & Consumer Math
- WEST Middle Grades Math: Number Patterns & Sequences
- WEST Middle Grades Math: Properties of Functions
- WEST Middle Grades Math: Graphing Functions
- WEST Middle Grades Math: Negative Numbers
- WEST Middle Grades Math: Absolute Value
- WEST Middle Grades Math: Inequalities
- WEST Middle Grades Math: Factoring
- WEST Middle Grades Math: Monomials & Polynomials
- WEST Middle Grades Math: Writing Algebraic Expressions
- WEST Middle Grades Math: Basic Algebraic Expressions
- WEST Middle Grades Math: Algebraic Distribution
- WEST Middle Grades Math: Writing & Solving One-Step Equations
- WEST Middle Grades Math: Writing & Solving Two-Step Equations
- WEST Middle Grades Math: Simplifying & Solving Rational Expressions
- WEST Middle Grades Math: The Coordinate Graph
- WEST Middle Grades Math: Linear Equations
- WEST Middle Grades Math: Systems of Linear Equations
- WEST Middle Grades Math: Rates, Ratios & Proportions
- WEST Middle Grades Math: Measurements
- WEST Middle Grades Math: Perimeter & Area
- WEST Middle Grades Math: Polyhedrons & Geometric Solids
- WEST Middle Grades Math: Properties of Lines
- WEST Middle Grades Math: Angles
- WEST Middle Grades Math: Triangles
- WEST Middle Grades Math: Triangle Theorems & Proofs
- WEST Middle Grades Math: Similar Polygons
- WEST Middle Grades Math: The Pythagorean Theorem
- WEST Middle Grades Math: Quadrilaterals
- WEST Middle Grades Math: Circles
- WEST Middle Grades Math: Circular Arcs & Measurement
- WEST Middle Grades Math: Transformations
- WEST Middle Grades Math: Data & Graphs
- WEST Middle Grades Math: Statistics
- WEST Middle Grades Math: Data Collection
- WEST Middle Grades Math: Samples & Populations
- WEST Middle Grades Math: Probability
- WEST Middle Grades Math: Sets
- WEST Middle Grades Mathematics Flashcards