## Keywords & Theorems

**Parts of Circles & Tangent Lines**

- Circle
- Center
- Radius
- 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
- Arc Addition Postulate

**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.

- minor arc - A.
- chord - B.
- tangent line - C.
- central angle - D.
- secant - E.
- radius - F.
- inscribed angle - G.
- center - H.
- major arc - I.
- point of tangency - J.

## 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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## Date Created:

Feb 22, 2012## Last Modified:

Oct 28, 2015
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