# 9.9: Study Guide

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

Keywords: Define, write theorems, and/or draw a diagram for each word below.

**\begin{align*}1^{st}\end{align*} 1st Section: Parts of Circles & Tangent Lines**

Circle

Radius

Diameter

Tangent

Congruent Circles

Concentric Circles

Externally Tangent Circles

Internally Tangent Circles

Common Internal Tangent

Common External Tangent

Tangent to a Circle Theorem

Theorem 9-2

Center

Chord

Secant

Point of Tangency

**Homework:**

**\begin{align*}2^{nd}\end{align*} 2nd Section: Properties of Arcs**

Central Angle

Arc

Semicircle

Minor Arc

Major Arc

Congruent Arcs

Arc Addition Postulate

**Homework:**

**\begin{align*}3^{rd}\end{align*} 3rd Section: Properties of Chords**

Theorem 9-3

Theorem 9-4

Theorem 9-5

Theorem 9-6

**Homework:**

**\begin{align*}4^{th}\end{align*} 4th Section: Inscribed Angles**

Inscribed Angle

Intercepted Arc

Inscribed Angle Theorem

Theorem 9-8

Theorem 9-9

Inscribed Polygon

Theorem 9-10

**Homework:**

**\begin{align*}5^{th}\end{align*} 5th Section: Angles from Chords, Secants and Tangents**

Theorem 9-11

Theorem 9-12

Theorem 9-13

**Homework:**

**\begin{align*}6^{th}\end{align*} 6th Section: Segments from Secants and Tangents**

Theorem 9-14

Theorem 9-15

Theorem 9-16

**Homework:**

**Extension: Equations of Circles**

Standard Equation of a Circle

**Homework:**

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