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Circle Terminology
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GEOMETRY

GEOMETRY

Circle Terminology

Slide 2

Radius (or Radii for plural)

Radius (or Radii for plural)

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

Example: OA

Slide 3

Diameter

Diameter

A chord that passes through the center of a circle.

Example: AB

Slide 4

Chord

Chord

A segment joining two points on a circle

Example: AB

Slide 5

Chord

Chord

A segment joining two points on a circle

Example: AB

Slide 6

Secant

Secant

A line that intersects the circle at exactly two points.

Example: AB

Slide 7

Secant

Secant

A line that intersects the circle at exactly two points.

Example: AB

Slide 8

Tangent

Tangent

A line that intersects a circle at exactly one point.

Example: AB

Slide 9

Central Angle

Central Angle

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

Example: Angle ABC

Slide 10

Inscribed Angle

Inscribed Angle

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

Example: Angle ABC

Slide 11

Arc

Arc

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

Slide 12

Intercepted Arc

Intercepted Arc

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

Example: arc AC

Slide 13

Two Intercepted Arc

Two Intercepted Arc

If angle is inside the circle.

Example: arc AC

arc DF

Slide 14

If angle is outside the circle.

If angle is outside the circle.

Example: arc DE

arc DC

Two Intercepted Arc

Slide 15

Investigating Measures of Angles Related to a Circle

Investigating Measures of Angles Related to a Circle

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