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Circle Vocabulary and Circumference

Total questions: 40

Worksheet time: 2hrs 39mins

Name
Class
Date
1.
a)
Secant
b)
Diameter
c)
Radius
d)
Chord
2.
a)
diameter
b)
radius
c)
center
3.
a)
center
b)
diameter
c)
radius
4.
a)
center
b)
diameter
c)
radius
5.

The definition of a true circle is:

a)

A set of points in a plane that are all the same distance from a given point, called the center.

b)

A round looking polygon with 360 degrees.

c)

Any polygon with curved lines.

d)

A plane figure that looks like a smashed basketball.

6.

A segment that has one endpoint at the center and the other endpoint on the circle is called:

a)

Diameter

b)

Circumference

c)

Radius

d)

Chord

7.

A segment that passes through the center and has both endpoints on the circle is:

a)

Diameter

b)

Circumference

c)

Radius

d)

Arc

8.

The radius is ___________ the length of the diameter.

a)

twice

b)

half

c)

three times

d)

equal to

9.

Does this picture show the diameter or radius of a circle?

a)

Diameter

b)

Radius

10.
Does this picture show the diameter or radius of a circle?
a)
Diameter
b)
Radius
11.
What is the radius of this circle?
a)
12cm
b)
6cm
c)
24cm
d)
3cm
12.
What is twice as long as a radius
a)
Center
b)
Diameter
c)
Tanget
d)
Arc
13.

The distance all the way around the circle is called the...

a)

radius

b)

diameter

c)

circumference

d)

area

14.
A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's approximate circumference?
a)
3 m 
b)
9.42 m
c)
12 m
d)
18.84 m
15.

The diagram below shows the radius of the circular opening of a bowl. What is the approximate circumference of the opening in centimeters?

a)

29.83

b)

9.5

c)

59.66

16.
What is the circumference?
a)
48
b)
96
c)
24
d)
18
17.
Steven purchases a bowl. The diameter of the bowl is 14 cm. What is the circumference of the bowl?
a)
28 cm
b)
43.98 cm
c)
87.96 cm
d)
7 cm
18.
Daniel wants to buy cookies for her friend. The radius of a cookie is 5 inches. What is the cookie’s circumference?
a)
10 in
b)
2.5 in
c)
15.7 in
d)
31.4 in 
19.
Cynthia wants to buy a round photo frame for her brother. The radius of the photo frame is 9 cm. What is the photo frame’s diameter?
a)
28.26 cm
b)
56.52 cm
c)
4.5 cm
d)
18 cm
20.
A circular swimming pool is 21 feet in diameter. What is the circumference of the pool?
a)
10.5 ft
b)
42 ft
c)
65.97 ft
d)
131.95 ft
21.
Determine the radius of the penny
a)
59.66 mm
b)
9.5 mm
c)
38 mm
d)
119.32 mm
22.
What is the circumference of this circle?
a)
3.14 cm 
b)
37.7 cm
c)
24 cm
d)
68.4 cm
23.
Find the circumference of a circle with a diameter of 11 millimeters.
a)
34.6 mm
b)
30 mm
c)
25.3 mm
d)
34.54 cm
24.
Find the circumference of a circle with a radius of 12.5 mm.
a)
37.68mm
b)
18.84mm
c)
78.54mm
d)
none of the above
25.
What is the circumference of the circle?
r=22in d=44in
a)
222in
b)
138.23in
c)
125.23in
d)
2.5in
26.
Find the circumference (to the nearest whole number)
a)
88 in
b)
44 in
c)
116 square in
d)
None of the above
27.
The radius of the circle is 9 meters.  What is the circle's circumference?
a)
9 meters
b)
28.26 meters
c)
56.52 meters
d)
18 meters
28.
A minute hand (radius) of a clock is 13.8 meters long. What is the circumference of the clock?
a)
86.70 meters
b)
76.66 meters
c)
66.66 meters
d)
96.66 meters
29.
What is the circumference of a circle with a diameter of 56 m?
a)
175.8 m
b)
176.8 m
c)
165.8 m
d)
186.8 m
30.
What is the circumference of a circle with a diameter of 92 in?
a)
288.88 in
b)
176.88 in
c)
165.88 in
d)
186.88 in
31.

What is the formula for finding the circumference of a circle?

a)

C = r2

b)

C = rd

c)

A = π·r2

d)

C = π·d

32.

What two formulas can you use to find the circumference?

a)

C = π·d

b)

C = π·r2

c)

C = 2·π·r

d)

C = d2

33.

What does d represent in the formula:

C = π·d

a)

diameter

b)

radius

c)

pi

d)

3.14

34.

What does C represent in the formula:

C = π·d

a)

Pi

b)

Circumference

c)

Diameter

d)

Area

35.

What number represents π?

a)

31.4

b)

4.13

c)

3.14

d)

34.1

36.

Find the circumference of the circle.

a)

31.4 cm

b)

78.5 cm

c)

314 cm

d)

15.7 cm

37.

Find the circumference of the circle.

a)

78.5 cm

b)

15.7 cm

c)

7.85 cm

d)

19.6 cm

38.
Pi is the ratio of a circle’s _________ to _________. 
a)
radius/diameter
b)
circumference/diameter
c)
area/circumference
d)
circumference/radius
39.

Which fraction is a good approximation for pi?

a)

22/3

b)

22/9

c)

22/7

d)

22/5

40.

How many digits are in pi?

a)

10 trillion

b)

5 billion

c)

infinite

d)

a lot

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