Circumference Of A Circle Geometry Template Page 2
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1
2ANSWER KEY
Circumference of a Circle
Circumference of a Circle
To find the circumference of a circle, use the formula pi x diameter = circumference.
To find the circumference of a circle, use the formula pi x diameter = circumference.
=
=
x
x
This formula is often written as
This formula is often written as
C
C
π
π
d
d
.
.
The circle pictured here has a diameter of 10 cm.
The circle pictured here has a diameter of 10 cm.
d
d
= 10 cm
= 10 cm
10 cm
10 cm
≈ 3.14
≈ 3.14
π
π
10 cm x 3.14 = 31.4 cm
10 cm x 3.14 = 31.4 cm
Find the circumference of each circle. Use 3.14 for pi.
Find the circumference of each circle. Use 3.14 for pi.
a.
b.
c.
6 cm
18.84 cm
21.98 m
12.56 km
d.
e.
f.
28.26 in.
34.54 mm
15.70 mi
g. Karla and Jeremy have a cicular pool
with a diameter of 12 feet. What is the
circumference of the pool?
3.14 x 12 = 37.68 ft
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