# Ch 16: 4th Grade Math: Angles

### About This Chapter

## Angles - Chapter Summary

The simple video lessons in the Angles chapter can teach 4th grade students to identify straight and adjacent angles. Students can also learn how to use protractors to measure different angles. The online video lessons are usually less than ten minutes long and come with multiple-choice quizzes and transcripts. A chapter examination is included as well to help you gauge your student's mastery of this math topic.

## Chapter Lessons and Objectives

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

What is an Acute Angle? - Definition, Description and Examples | Instructors explain how to identify an acute angle. |

What is an Obtuse Angle? - Definition and Examples | Students learn the characteristics of obtuse angles. |

What is a Right Angle? - Definition, Formula and Quiz | In this lesson, students are taught to identify right angles. |

Identifying Straight Angles | Instructors provide the definition of a straight angle and teach students to identify it. |

Angles of 90, 180, 270 and 360 Degrees | In this lesson, instructors demonstrate how to measure angles of varying degrees. |

How to Measure Angles with a Protractor | The process of measuring angles with a protractor is demonstrated in this video lesson. |

Working with Adjacent Angles | Students are taught to compare and properly measure adjacent angles. |

### 1. Identifying Straight Angles

After viewing this lesson, you should know what a straight angle looks like. You should also know what a straight angle does and how you can identify one.

### 2. Angles of 90, 180, 270 & 360 Degrees

Angles make up the physical structures all around us, from street corners and traffic signs, to buildings, to the chair you're sitting on right now. In this lesson, we will explore the key angles of 90, 180, 270, and 360 degrees as they appear in mathematics and in the structures around us.

### 3. How to Measure Angles with a Protractor

You're surrounded by angles at home, at school, and even when you're walking down the street. In this lesson, you'll learn how to measure different angles using a protractor.

### 4. Working with Adjacent Angles

After watching this video lesson, you will know how to work with adjacent angles. You will know how to identify them, how to find the sum of the adjacent angles and how to find the measure of a missing angle.

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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: Triangles
- 4th Grade Math: Quadrilaterals
- 4th Grade Math: Circles
- 4th Grade Math: Polyhedrons & Geometric Solids
- 4th Grade Math: Perimeter, Area & Volume
- 4th Grade Math: Symmetry, Similarity & Congruence
- 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