NAME _____________________________________________ DATE __________________ PERIOD _________
Lesson 2 Homework Practice
Area of Circles
22
Find the area of each circle. Round to the nearest tenth. Use 3.14 or −−
7
for π.
1.
2.
3.
7.1 m
3.14 × 7.1 × 7.1 = 158.3 m2
3.14 × 6 × 6 = 113 ft2
4.
5.
4 in.
3.14 × 6.5 × 6.5 = 132.7 km2
6.
42 yd
5.6 cm
22
× 21 × 21 = 1,386 yd2
−−
7
3.14 × 4 × 4 = 50.2 in2
1
8. radius = 3−
ft
7. diameter = 9.4 mm
2
3.14 × 2.8 × 2.8 = 24.6 cm2
9. radius = 8 in.
22
7
7
1 2
×−
×−
= 38 −
ft
−−
7
2
2
2
3.14 × 4.7 × 4.7 = 69.4 mm2
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13 km
12 ft
3.14 × 8 × 8 = 201.0 in2
Find the area of each semicircle. Round to the nearest tenth.
Use 3.14 for π.
10.
11.
12.
6.1 m
3.8 yd
≈ 22.7 yd2
≈ 58.4 m2
14 cm
≈ 76.9 cm2
13. SPOTLIGHT A spotlight can be adjusted to effectively light a circular area of up to 6
meters in diameter. To the nearest tenth, what is the maximum area that can be
effectively lit by the spotlight? 28.3 m2
14. ARCHERY The bull’s eye on an archery target
has a radius of 3 inches. The entire target has a
radius of 9 inches. To the nearest tenth, find
the area of the target outside of the bull’s eye.
226.1 in2
Course 2 • Chapter 8 Measure Figures
3 in.
9 in.
121