Circle Vocab

Circle Vocab

Today, you are going explore new circle vocabulary and review old vocabulary.

Review of the Basics

• Circle - A set of points equidistant from a point

• Radius - The distance from the edge of the circle to the center of the circle

• Diameter - The distance from one edge of the circle of to the other edge through the center

New Vocab on Lines & Segments

• Chord - A line segment whose endpoints are on a circle

• Secant - A line that intersects a circle in two points

• Tangent - A line that intersects a circle in exactly one point.

• Point of Tangency - The point where a tangent line touches the circle

Multiple Choice

The diameter of a circle is also a.....

• Secant

• Tangent

• Chord

• A Point of Tangency

Multiple Select

Identify the chords in this image.

• $\overline{DG}$

• $\overline{HF}$

• $\overline{AF}$

• $\overline{BD}$

Multiple Select

Identify the secants in this image.

• $\overline{DG}$

• Line JB

• Line BD

• $\overline{HF}$
  

  
  

Multiple Select

Identify the tangents in this image

• Line BD

• Line JB

• $\overline{HF}$

• $\overline{DG}$

Multiple Choice

What is the point of tangency?

• B

• D

• H

• C

• F

Arc & Angle Review

• Central Angle - An angle whose vertex is at the center of the circle

• Minor Arc - Points that lie on the interior of the central angle with a measure less than 180 degrees

• Major Arc - The remaining points of the circle that do not lie on the minor arc

• Semi Circle - An Arc measuring 180 degrees

Multiple Choice

Which is true of a minor arc?

• It forms half a circle.

• It forms a whole circle.

• It measures less than 180 degrees.

• It measures greater than 180

Multiple Choice

Which is true of a major arc?

• It forms half a circle.

• It forms a whole circle.

• It measures less than 180 degrees.

• It measure greater than 180

Multiple Choice

Which is true of a semi circle?

• It forms half a circle.

• It forms a whole circle.

• It measures less than 180 degrees.

• It measure greater than 180

Multiple Choice

The bolded portion of the circle is a.......

• Minor Arc

• Major Arc

• Semi-Circle

Multiple Choice

The bolded portion of the circle is a.......

• Minor Arc

• Major Arc

• Semi-Circle

Arc Review Continued

- Arc Measure - The number of degrees covered by an arc

- Circumference - The perimeter of a circle

- Arc Length - The length of an arc along its circumference

Multiple Choice

The distance along an arc

• area of a sector

• arc length

• arc of a circle

• sector of a circle

• arc measure

Multiple Select

Choose all of the correct answers.

• EAB is a major arc and its measure is 180 degrees

• EAB is a semicircle and its measure is 180 degrees

• ABC is a is a semicircle and its measure is 180 degrees

• DC is a minor arc and its measure is 65

Multiple Select

Choose all of the correct answers.

• BAC is a minor arc and its measure is 290 degrees

• ABC is a semicircle and its measure is 180 degrees

• EBD is a major arc and its measure is 315 degrees

• DC is a minor arc and its measure is 70 degrees

New Arc Vocab

• Recall: A central angle is an angle whose vertex is in the center of the circle

• Inscribed angles are created by two chords meeting ON the perimeter of the circle.

• Intercepted arc the portion of the circumference between the line segments of either the central angle or inscribed angle

What else can be inscribed?

Shapes can be inscribed. This means that a shape is completely inside a circle with its vertices on the circumference of the circle.

Multiple Choice

An angle in a circle with vertex on the center of the circle

• Central angle
• Angle
• Inscribed angle
• Circle

Multiple Choice

An angle in a circle with vertex on the circle itself

• Angle
• Central angle
• Inscribed angle
• Chord

Multiple Choice

This is a picture of ___________.

• Major Arc
• Minor Arc
• Central Angle
• Inscribed Angle

Multiple Choice

Which number best represents an intercepted arc?

• 1
• 2
• 6
• 9

Multiple Choice

Which number best represents an inscribed angle?

• 1
• 2
• 8
• 9

Let's Review It All

Find out how well you really know circles

Multiple Choice

Name a chord.

• Segment XC
• Segment KM
• Segment FG
• LINE BD

Multiple Choice

Name a Diameter.

• DE
• GA
• CB
• AB

Multiple Choice

Name a Secant.

• DE
• EA
• CB
• AB

Multiple Choice

Name a Tangent

• Segment AG
• Line AG
• Line DE
• Segment

Multiple Choice

How many degrees are in a cirlce?

• 90
• 180
• 270
• 360

Multiple Choice

A minor arc measures more than 180 degrees.

• True
• False

Multiple Choice

• Name Chords: WX & UV
• Name Chords: OR UV, & TS
• Name Chords: UV
• Name Chords: YZ & AB

Multiple Choice

• How many chords are there: 1
• How many chords are there: 5
• How many chords are there: 3
• How many chords are there: 0

Multiple Choice

• Diameter is: DE
• Diameter is: BA
• Diameter is: BC
• Diameter is: DC

Multiple Choice

What is it called when we extend a cord past the circle?

• Tanget
• Secant
• Chord
• Center

Multiple Choice

An arc is a smaller piece of the...

• Chord
• Center
• Circumference
• Radius

Multiple Choice

What is the name for the distance around a circle?

• Diameter
• Radius
• Circumference
• Chord

Multiple Choice

A line that passes through the circle.

• chord
• radius
• secant
• tangent

Multiple Choice

A line that touches a circle in just one point.

• tangent
• chord
• secant
• radius

Multiple Choice

A segment that connects two points on a circle; may or may not pass through the center of the circle.

• tangent
• secant
• chord
• diameter

Multiple Choice

A segment connecting two points on a circle that passes through the center.

• diameter
• radius
• secant
• tangent

Multiple Choice

A segment that connects the center of a circle with a point on the circle.

• tangent
• secant
• diameter
• radius