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Ch 25: SBA Math - Grade 8: Lines & Angles

About This Chapter

If your 8th graders need to strengthen or improve their comprehension of lines and angles, have them watch this chapter's video lessons. Our instructors cover line segments, geometric constructions, types of angles and more to help students who must take the 8th grade SBA in math.

SBA Math - Grade 8: Lines & Angles - Chapter Summary

In this chapter, students review the math concepts, principles and tools used to understand geometric shapes, angles, line segments and rays. By the time they finish all of the engaging video lessons, middle schoolers will be ready to complete the following objectives on the day of the 8th grade Smarter Balanced Assessment (SBA) in math:

  • Distinguish between line segments and rays
  • Define geometric points, lines and angles
  • Use tools to make geometric constructions
  • Explain the midpoint theorem
  • Divide a line segment equally
  • Describe right, acute and obtuse angles
  • Identify the types of angles
  • Construct angle bisectors
  • Create geometric shapes inscribed in circles

Our short videos contain not only simplified explanations of concepts but also fun animations that show students how to use tools like the compass and straight edge. Professional instructors take 8th graders through the process of interpreting and answering sample problems so that they'll be able to respond to line or angle questions with confidence.

SBA Math - Grade 8: Lines & Angles - Chapter Objectives

The 8th grade SBA in math contains questions that cover four claims or categories based on Common Core State Standards. The assessment measures students' math knowledge and skills in problem solving, data analysis, reasoning and more. Questions on lines and angles are found in the SBA's concepts and procedures portion, which is made up of 17 to 20 problems.

When students take advantage of our lessons, they get access to multiple-choice quizzes that assess their comprehension of the chapter material. These quizzes contain questions in a format similar to the selected-response items on the SBA. The SBA also features technology-enhanced questions, extended-response problems and performance tasks.

12 Lessons in Chapter 25: SBA Math - Grade 8: Lines & Angles
Test your knowledge with a 30-question chapter practice test
Line Segments & Rays: Definition & Measurement

1. Line Segments & Rays: Definition & Measurement

Watch this video lesson to learn the difference between a line segment and a ray. You will also learn how to measure and add line segments. Learn why you can't measure or add a ray.

Points, Lines & Angles in Geometry

2. Points, Lines & Angles in Geometry

After watching this video lesson, you should understand the basic terms that form the foundation of geometry. Learn what a point is, what a line is, what an angle is, and learn about a special type of angle called a right angle.

Geometric Constructions Using Lines and Angles

3. Geometric Constructions Using Lines and Angles

Watch this video lesson to learn about geometric construction and how you can copy line segments and angles without using any numbers. All you need is a straight edge and a compass.

Practice Making Geometric Constructions with Tools

4. Practice Making Geometric Constructions with Tools

There are a number of tools available to geometry students to help make their work a bit easier. In this lesson, we will review how to use many of them in order for you to get the most out of every geometry class.

Line Segment Bisection & Midpoint Theorem: Geometric Construction

5. Line Segment Bisection & Midpoint Theorem: Geometric Construction

Watch this video lesson and you will learn how to bisect a line segment without measurements using just a compass and a straight edge. You'll also learn about the midpoint theorem, which lets you calculate the midpoint if you have the measurements.

Dividing Line Segments into Equal Parts: Geometric Construction

6. Dividing Line Segments into Equal Parts: Geometric Construction

Watch this video lesson to learn one way to easily divide any line segment into as many equal parts as you need. Also, learn where in real life this skill comes in handy.

What is an Acute Angle? - Definition, Description & Examples

7. What is an Acute Angle? - Definition, Description & Examples

In this lesson, you'll learn what makes an angle acute and see a few different examples of them. After the lesson, you can test your new knowledge with a brief quiz.

What is an Obtuse Angle? - Definition & Examples

8. What is an Obtuse Angle? - Definition & Examples

In this lesson, you'll learn what angles, right angles, and obtuse angles are; you'll see a few examples of different obtuse angles. Test your knowledge with a brief quiz once you've completed the lesson.

What is a Right Angle? - Definition & Formula

9. What is a Right Angle? - Definition & Formula

In this lesson, you will learn about the properties that identify right angles. You will also discover where right angles can be found and learn about what makes them so useful. You can then test your knowledge with a quiz.

Types of Angles: Vertical, Corresponding, Alternate Interior & Others

10. Types of Angles: Vertical, Corresponding, Alternate Interior & Others

In addition to basic right, acute, or obtuse angles, there are many other types of angles or angle relationships. In this lesson, we will learn to identify these angle relationships and discuss their measurements.

Constructing an Angle Bisector in Geometry

11. Constructing an Angle Bisector in Geometry

Watch this video lesson to learn a cool way to split an angle in half. You can use this method to split a pie slice in half where you can be sure each side is equal.

Constructing Equilateral Triangles, Squares, and Regular Hexagons Inscribed in Circles

12. Constructing Equilateral Triangles, Squares, and Regular Hexagons Inscribed in Circles

Constructing an accurate triangle, square, or hexagon within a circle is a matter of a few simple steps, and can be extremely practical. In this lesson, we'll practice the construction of those three shapes.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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Other Chapters

Other chapters within the Smarter Balanced Assessments - Math Grade 8: Test Prep & Practice course

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