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Lesson 4: Calculating Circumference



 1. 

What is the diameter of a circle if the radius is 4.5 m?
a.
9 m
b.
2.25 m
c.
12 m
d.
15 m
 

 2. 

What is the radius of a circle if the diameter is 7.5 cm?
a.
15 cm
b.
3.25 cm
c.
3.8 cm
d.
14 cm
 

 3. 

Determine the circumference of a circle with each diameter.

d = 4.5 m
a.
12.1 m
b.
13.1 m
c.
14.1 m
d.
15.1 m
 

 4. 

d = 7 m
a.
15 m
b.
14 m
c.
20 m
d.
22 m
 

 5. 

d = 6.6 cm
a.
9.31 cm
b.
3.3 cm
c.
20.7 cm
d.
18.5 cm
 

 6. 

d = 8.95 m
a.
27.756 m
b.
78.556 m
c.
28.10 m
d.
45.1 m
 

 7. 

Determine the circumference of a circle with each radius.

r = 5.5 cm
a.
34.5 cm
b.
32.4 cm
c.
19.8 cm
d.
33.55 cm
 

 8. 

r = 8 mm
a.
13.6 mm
b.
50mm
c.
25 mm
d.
19.7 mm
 

 9. 

r = 9.8 cm
a.
89.66 mm
b.
45.8 mm
c.
61.5 cm
d.
56.7 mm
 

 10. 

r = 5.5 cm
a.
33.12 cm
b.
65.3 cm
c.
34.5 cm
d.
56.33 cm
 



 
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