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**Identifying parts of the circle**

Circles Identifying parts of the circle

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Vocabulary Radius Chord Diameter Arc Center

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Center and Arc B C — A A circle can be named by its center. A circle with a center labeled C would be named circle C. An unbroken part of a circle is called an arc.

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**Radius A radius connects the center with a point on the circle.**

radius CD D C —

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**A chord connects two points on a circle. chord AB**

— B — A

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diameter A diameter is a chord that passes through the center of a circle. diameter AB A — — B

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**Lesson Quiz Use the given diagram for the following:**

1. Name two radii. 2. Name two chords. 3. Name the center of the circle. 4. Name a diameter. 5. Name an arc of the circle. H A — G J E D F C B K

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Geometry Chapter 9 Section 1 Circles. Circle The set of all points in a plane that are a given distance from a center point Radius a line segment from.

Geometry Chapter 9 Section 1 Circles. Circle The set of all points in a plane that are a given distance from a center point Radius a line segment from.

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