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Ch 39: ORELA Math: Circles & Arc of a Circle

About This Chapter

The National Evaluation Series (NES) test for teacher certification has replaced the ORELA Math test in the state of Oregon. Study this chapter's online video lessons and take the quizzes on circles in preparation for passing the test.

ORELA Math: Circles & Arc of a Circle - Chapter Summary

Let this chapter's video lessons reinforce your understanding of circles as you prepare for the ORELA Math examination. Re-examine what you know about secants, chords and tangent theorems and other key terms and concepts. Distinguish between circles and circular arcs as well as major and minor arcs. Watch the educational video lessons for help with:

  • Calculating the circumference and area of a circle
  • Describing the parts of a circle
  • Creating inscribed and central angles
  • Finding the degree measurement of inscribed circles and arcs
  • Understanding circle theorems
  • Measuring the angles and chords of circles
  • Defining a sector and finding its area

Study these entertaining video lessons in order to prepare for the ORELA Math examination. Learn anywhere as long as you have a web-connected device. Ask questions of the credentialed lesson instructors and consult the corresponding transcripts if you prefer. After watching each of the lessons, test your knowledge by taking the short quizzes that follow.

9 Lessons in Chapter 39: ORELA Math: Circles & Arc of a Circle
Test your knowledge with a 30-question chapter practice test
Circles: Area and Circumference

1. Circles: Area and Circumference

Understanding how to calculate the area and circumference of circles plays a vital role in some of our everyday functions. They serve as the foundation for operating with three-dimensional figures. Learn more about the area and circumference of circles in this lesson.

Circular Arcs and Circles: Definitions and Examples

2. Circular Arcs and Circles: Definitions and Examples

What is a circle? In this lesson, find out all about the circle and its many parts, including circular arcs and semicircles. Also, discover how a locus works in creating a circle, parallel lines and more.

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.

How to Find the Measure of an Inscribed Angle

5. How to Find the Measure of an Inscribed Angle

Finding the measure of an inscribed angle requires knowing a little information. In this lesson, we'll find the measure of an inscribed angle when we know the measure of the central angle or one or more of the arcs formed by the angle.

Tangent of a Circle: Definition & Theorems

6. 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.

Measurements of Angles Involving Tangents, Chords & Secants

7. 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

8. 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.

Arc Length of a Sector: Definition and Area

9. Arc Length of a Sector: Definition and Area

In this lesson, we'll slice up a circle like it's a pizza and learn how to find out useful information about our slices. We'll find out the area of these sectors, or pie slices. We'll also learn about arc lengths.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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Other chapters within the ORELA Mathematics: Practice & Study Guide course

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