Circle Vocabulary

Circle Vocabulary

By Cassie Bartley

Circle Vocabulary Part 1

​CIRCLE

​the set of all points that are the same distance from the center

​

​every circle has 360 degrees

center to circle

RADIUS

the distance from the center point to a point on the circle

​

​CHORD

​a segment whose endpoints are on the circle

​DIAMETER

• ​the distance across the circle through the center

• ​a chord that passes through the center of the circle

​The radius is half of the diameter

​The diameter is double the radius

Multiple Choice

A line segment that goes through the center of a circle is called

• radius

• tangent

• diameter

• chord

Multiple Choice

A line segment from the center to a point on the circle is called

• tangent

• radius

• half- chord

• chord

Multiple Choice

A segment whose end points lie on the circle is called

• diameter

• radius

• chord

• circumference

Multiple Choice

What is the diameter?

• 8
• 16
• 10
• 4

Multiple Choice

What is the radius?

• 18
• 72
• 38
• 14

Multiple Choice

The definition of a circle is

• set of all points in a plane that are the same distance from a point called the center

• the distance around a secant

• a large figure

• a pizza, orange, plum, or watermelon

​SECANT LINE

​a line that intersects a circle at at two points

​

​

​TANGENT LINE

​a line that intersects a circle at exactly one point, the point of tangency

​

​CHORD vs SECANT

​Chord is a segment meaning it has endpoints

​

​

​

​​Secant goes through the circle

Multiple Choice

What is this called?

• Chord

• Minor arc

• Secant

• Diameter

Multiple Choice

What is this called?

• Tangent Line

• Secant

• Chord

• Diameter

Draw

Draw a radius.

Draw

Draw a diameter.

Draw

Draw a chord.

Draw

Draw a secant line.

Draw

Draw a tangent line.

Multiple Choice

It is the distance from the center to any point in the circle.

• Circumference

• Diameter

• Segment

• Radius

Multiple Choice

It is the distance across the circle that passes through the center

• Radius

• Diameter

• Circumference

• Chord

Fill in the Blanks

A

is the set of all points that are equidistant from another single point called the center.

Multiple Choice

What is $$\overleftarrow{B}\overrightarrow{D}$$  ?

• Radius

• Secant

• Tangent

Multiple Choice

What is $$\overline{AF}$$  ?

• Chord

• Radius

• Secant

• Tangent

Multiple Choice

What is A?

• Point of Tangency

• Radius

• Center Point

• Tangent

Multiple Choice

What is H?

• Point of Tangency

• Radius

• Circle

Multiple Choice

What is $$\overline{HA}$$  ?

• Point of Tangency

• Radius

• Circle

• Tangent

Multiple Choice

What is $$\overleftarrow{J}\overrightarrow{B}$$  ?

• Secant

• Radius

• Chord

• Tangent

Multiple Choice

What is $$\overline{DG}$$  ?

• Secant

• Radius

• Chord

• Tangent

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

What is the diameter?

• 5 in
• 10 in
• 3.14 in
• 15.84 in

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

A diameter is also a chord. 

• True
• False 

Multiple Select

Select each Radius in the image.

SELECT THREE

• $$\overline{DA}$$  

• $$\overline{DB}$$  

• $$\overline{DC}$$  

• $$\overline{BC}$$  

• $$\overline{AC}$$  

Multiple Choice

If the radius is 4, the diameter is

• 2

• 4

• 8

• $$\pi$$

Multiple Choice

What is the radius if the diameter is 10 m ?

• 5
• 20
• 2

By Cassie Bartley

Circle Vocabulary Part 2

​REVIEW!!!

​​REVIEW!!!

Fill in the Blanks

A

is the set of all points that are equidistant from another single point called the center.

Multiple Choice

It is the distance across the circle that passes through the center

• Radius

• Diameter

• Circumference

• Chord

​Circumference

​The circumference of a circle is the distance around the circle.

​

​

If you imagine the circle as a piece of string, it is the length of the string.

​

Multiple Choice

Which is true of a minor arc?

• It forms half a circle.
• It forms a whole circle.
• It measures greater than 180 degrees. 
• It measures less than 180 degrees.

Multiple Choice

Which is true of a major arc?

• Forms half a circle.
• Forms a whole circle.
• Measures greater than 180 degrees.
• Measures less than 180 degrees.

Multiple Choice

Which of the following would be a major arc in the diagram?

• BC
• BCD
• CD
• AB

Multiple Choice

Name a minor arc

• AD
• ADB
• AB
• CD

Multiple Choice

Name a semicircle.

• AD
• ABC
• BA
• BCA

Multiple Choice

What type of arc is arc AE?

• Major
• Minor
• Semi-circle
• Noah's

Multiple Choice

What type of arc is arc ABD?

• Major
• Minor
• Semi-circle
• Diameter

Multiple Choice

What type of arc is arc EC?

• Major
• Minor
• Semi-circle
• Radius

Multiple Choice

What type of arc is arc NMQ?

• Major
• Minor
• Semi-circle
• Sector

Multiple Choice

What type of arc is arc DGA?

• Major
• Minor
• Semi-circle
• Diameter

Multiple Choice

Correctly name a minor arc.

• arc AEC

• arc ADE

• arc AB

• arc AC

Central Angle

• A central angle of a circle has a vertex at the center and is formed by two radii.

Multiple Choice

What is this called?

• Radius

• Central Angle

• Major Arc

• Inscribed Angle

Multiple Choice

What is this called?

• Tangent Line

• Central Angle

• Chord

• Inscribed Angle

​Time to practice all of your words!

• Center Point

• ​radius

• ​chord

• ​diameter

• ​tangent line

• ​point of tangency

• ​secant line

• Circumference

• ​major arc

• ​minor arc

• ​semicircle

• ​central angle

• ​inscribed angle

Multiple Choice

What is this called?

• Chord

• Minor arc

• Secant

• Diameter

Multiple Choice

What is this called?

• Radius

• Central Angle

• Major Arc

• Inscribed Angle

Multiple Choice

What is this called?

• Tangent Line

• Secant

• Chord

• Diameter

Multiple Choice

What is this called?

• Tangent Line

• Central Angle

• Chord

• Inscribed Angle

Multiple Choice

What is this called?

• Circumference

• Minor Arc

• Major Arc

• Inscribed Angle

Multiple Choice

What is this called?

• Circumference

• Minor Arc

• Major Arc

• Inscribed Angle

Multiple Choice

What is this called?

• Major Arc

• Minor Arc

• Circumference

• Perimeter

Multiple Choice

A segment with 2 endpoints on the circle.

• Chord
• Diameter
• Radius
• Inscribed Angle

Multiple Choice

This is a picture of ___________.

• Chord
• Diameter
• Radius
• Inscribed Angle

Multiple Choice

This is a picture of ___________.

• Chord
• Diameter
• Radius
• Inscribed Angle

Multiple Choice

A segment that goes from edge to edge through the center.

• diameter

• radius

• tangent

• chord

Multiple Choice

A line that touches the circle only once.

• diameter

• radius

• tangent

• chord

Multiple Choice

A line that goes through a circle intersecting the circle at two points.

• diameter

• chord

• tangent

• secant

Multiple Choice

The perimeter of a circle is called...

• circumference

• arc

• radius

• tangent

Multiple Choice

A piece of the circumference is called...

• radius

• diameter

• arc

• tangent

Multiple Choice

This is a picture of ___________.

• Minor Arc
• Major Arc
• Semi-Circle
• Central Angle

Multiple Choice

This is a picture of ___________angle.

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

Multiple Choice

This is a picture of ___________ angle.

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