# Chapter 9: Circles

Difficulty Level:

**At Grade**Created by: CK-12

First, we will define all the parts of circles and explore the properties of tangent lines, arcs, inscribed angles, and chords. Next, we will learn about angles and segments that are formed by chords, tangents and secants. Lastly, we will place circles in the coordinate plane and find the equation of and graph circles.

Chapter Outline

- 9.1.
## Parts of Circles & Tangent Lines

- 9.2.
## Properties of Arcs

- 9.3.
## Properties of Chords

- 9.4.
## Inscribed Angles

- 9.5.
## Angles of Chords, Secants, and Tangents

- 9.6.
## Segments of Chords, Secants, and Tangents

- 9.7.
## Extension: Writing and Graphing the Equations of Circles

- 9.8.
## Chapter 9 Review

- 9.9.
## Study Guide

### Chapter Summary

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This chapter covers all the parts of a circle and explores the properties of tangent lines, arcs, inscribed angles, chords, angles and segments that are formed by chords, tangents and secants, equations and graphs of circles.

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Date Created:

Feb 22, 2012
Last Modified:

Jan 14, 2016
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