Name:
Area of a Circle
18
cm
A= � r²
� ≈ 3.14
A= 3.14 ∙ 81
A= 254.34 cm
Find the area of each circle. Use 3.14 for pi. Show your work.
a.
b.
8 mm
m
6k
16
m
cm
d.
7m
c.
e.
f.
5m
20 km
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ANSWER KEY
Area of a Circle
18
A= � r²
� ≈ 3.14
A= 3.14 ∙ 81
A= 254.34 cm
cm
Find the area of each circle. Use 3.14 for pi. Show your work.
a.
b.
A= �r ²
m
6k
8 mm
A= 3.14 ∙ 36
A = 113.04 km
2
50.24 mm2
d.
m
A= �r ²
7m
c.
cm
A= 3.14 ∙ 16
A= 50.24 mm2
113.04 km2
A= 3.14 ∙ 64
16
A= � r²
A = 200.96 cm
A= � r²
A= 3.14 ∙ 49
2
A= 153.86 mm2
200.96 cm2
153.86 mm2
e.
f.
5m
A= �r ²
A= 3.14 ∙ 25
A = 78.50 m
78.50 m2
20 km
2
A= � r²
A= 3.14 ∙ 100
A= 314.00 km2
314.00 km2
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