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GEOMETRY

Circle Terminology

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The segment joining the center of a circle to a point on the circle.

Example: OA

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A chord that passes through the center of a circle.

Example: AB

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A segment joining two points on a circle

Example: AB

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Chord

A segment joining two points on a circle

Example: AB

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A line that intersects the circle at exactly two points.

Example: AB

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Secant

A line that intersects the circle at exactly two points.

Example: AB

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A line that intersects a circle at exactly one point.

Example: AB

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An angle whose vertex is at the center of a circle.

Example: Angle ABC

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An angle whose vertex is on a circle and whose sides are determined by two chords.

Example: Angle ABC

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A figure consisting of two points on a circle and all the points on the circle needed to connect them by a single path.

Example: arc AB

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An arc that lies in the interior of an inscribed angle.

Example: arc AC

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If angle is inside the circle.

Example: arc AC

arc DF

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If angle is outside the circle.

Example: arc DE

arc DC

Two Intercepted Arc

Slide 15

Click on GSP 4.00 on the desktop.

Follow the instructions on the handout.

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- Radius (or Radii for plural)
- Diameter
- Chord
- Secant
- Tangent
- Central Angle
- Inscribed Angle
- Arc
- Intercepted Arc
- Two Intercepted Arc
- Investigating Measures of Angles Related to a Circle

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