# 9.9: Study Guide

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

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

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:**

Central Angle

Arc

Semicircle

Minor Arc

Major Arc

Congruent Arcs

Arc Addition Postulate

**Homework:**

Theorem 9-3

Theorem 9-4

Theorem 9-5

Theorem 9-6

**Homework:**

Inscribed Angle

Intercepted Arc

Inscribed Angle Theorem

Theorem 9-8

Theorem 9-9

Inscribed Polygon

Theorem 9-10

**Homework:**

Theorem 9-11

Theorem 9-12

Theorem 9-13

**Homework:**

Theorem 9-14

Theorem 9-15

Theorem 9-16

**Homework:**

**Extension: Equations of Circles**

Standard Equation of a Circle

**Homework:**