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Ch 9: Holt Geometry Chapter 9: Circles

About This Chapter

The Circles chapter of this Holt Geometry Textbook Companion Course helps students learn the essential geometry lessons of circle properties. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Circles textbook chapter.

How it works:

  • Identify the lessons in Holt Geometry's Circles chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the circle topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Properties of tangents, chords and secants
  • Applications of tangent theorems
  • Definitions of central and inscribed angles
  • Methods for calculating circle arcs
  • Processes for measuring angles and lengths
  • Formulas for the graphs of circles

Holt Geometry is a registered trademark of Holt, Rinehart and Winston, which is not affiliated with Study.com.

7 Lessons in Chapter 9: Holt Geometry Chapter 9: Circles
Test your knowledge with a 30-question chapter practice test
Properties of Shapes: Circles

1. Properties of Shapes: Circles

Circles are fundamental to everything we do. But, did you know they're much more than just round shapes? In this lesson, we'll look at the various parts of circles and how they all relate.

Tangent of a Circle: Definition & Theorems

2. Tangent of a Circle: Definition & Theorems

What happens when a line just barely touches a circle? It's a tangent! In this lesson, we'll learn all about tangents to circles, including a few key theorems. We'll also look at tangent circles.

Central and Inscribed Angles: Definitions and Examples

3. Central and Inscribed Angles: Definitions and Examples

When we're working with circles, there are two key angles to know: central angles and inscribed angles. These angles have a few special theorems, which we'll discuss and practice using in this lesson.

Measure of an Arc: Process & Practice

4. Measure of an Arc: Process & Practice

What is the measure of an arc? And what is the difference between a minor arc and a major arc? Find out all that and practice finding the measure of an arc in this lesson.

Measurements of Angles Involving Tangents, Chords & Secants

5. Measurements of Angles Involving Tangents, Chords & Secants

When lines and circles meet, angles are formed. Fortunately, we can determine the measure of these angles, whether they're formed by tangents, secants or chords, just by knowing the measure of the created arcs.

Measurements of Lengths Involving Tangents, Chords and Secants

6. Measurements of Lengths Involving Tangents, Chords and Secants

The lengths of chords, tangents and secants take on unique relationships when they're drawn on circles. In this lesson, we'll define those relationships and see them in action.

Graphing Circles: Identifying the Formula, Center and Radius

7. Graphing Circles: Identifying the Formula, Center and Radius

Discover how to graph circles by finding key information like the center and radius. Identify circles by simply looking at the formula, and vice versa.

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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