# 9.8: Chapter 9 Review

Difficulty Level: At Grade Created by: CK-12

## Keywords & Theorems

Parts of Circles & Tangent Lines

• Circle
• Center
• Chord
• Diameter
• Secant
• Tangent
• Point of Tangency
• Congruent Circles
• Concentric Circles
• Externally Tangent Circles
• Internally Tangent Circles
• Common Internal Tangent
• Common External Tangent
• Tangent to a Circle Theorem
• Theorem 9-2

Properties of Arcs

• Central Angle
• Arc
• Semicircle
• Minor Arc
• Major Arc
• Congruent Arcs

Properties of Chords

• Theorem 9-3
• Theorem 9-4
• Theorem 9-5
• Theorem 9-6

Inscribed Angles

• Inscribed Angle
• Intercepted Arc
• Inscribed Angle Theorem
• Theorem 9-8
• Theorem 9-9
• Inscribed Polygon
• Theorem 9-10

Angles from Chords, Secants and Tangents

• Theorem 9-11
• Theorem 9-12
• Theorem 9-13

Segments from Secants and Tangents

• Theorem 9-14
• Theorem 9-15
• Theorem 9-16

Extension: Equations of Circles

• Standard Equation of a Circle

## Vocabulary

Match the description with the correct label.

1. minor arc - A. \begin{align*}\overline{CD}\end{align*}
2. chord - B. \begin{align*}\overline{AD}\end{align*}
3. tangent line - C. \begin{align*}\overleftrightarrow{CB}\end{align*}
4. central angle - D. \begin{align*}\overleftrightarrow{EF}\end{align*}
5. secant - E. \begin{align*}A\end{align*}
6. radius - F. \begin{align*}D\end{align*}
7. inscribed angle - G. \begin{align*}\angle BAD\end{align*}
8. center - H. \begin{align*}\angle BCD\end{align*}
9. major arc - I. \begin{align*}\widehat{BD}\end{align*}
10. point of tangency - J. \begin{align*}\widehat{BCD}\end{align*}

## Texas Instruments Resources

In the CK-12 Texas Instruments Geometry FlexBook, there are graphing calculator activities designed to supplement the objectives for some of the lessons in this chapter. See http://www.ck12.org/flexr/chapter/9694.

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