NAME _____________________________________________ DATE ____________________________ PERIOD _____________
Homework Practice
SHOW WORK!!!!!!!
Circumference
Find the radius or diameter of each circle with the given dimensions.
1. d = 18 in.
4. r = 13 mm
Find the circumference of each circle. Use 3.14 for π. Round to the nearest tenth if necessary.
5.
6.
11. r = 42 cm
14. a tire with a radius of 22 centimeters
7.
12. r = 15 yd
13. d = 31 m
15. a helicopter pad with a diameter of 15 yards
16. PLANTS The world’s largest flower, the Giant Rafflesia, is 91 centimeters in diameter. Use a calculator to find the
circumference of a Giant Rafflesia to the nearest tenth.
1
17. GEOLOGY Ubehebe Crater in Death Valley has a diameter of a little more than 2 mile. If Latisha walks around its
rim at a rate of 2 miles per hour, about how long will it take her to walk all the way around the crater? Find your
answer to the nearest tenth. Use 3.14 for π.
Measure Figures
119
NAME _____________________________________________ DATE ____________________________ PERIOD _____________
Area of Circles
Find the area of each circle. Round to the nearest tenth. Use 3.14 or
1.
2.
7. diameter = 9.4 mm
𝟐𝟐
𝟕
for π.
3.
1
8. radius = 3 2 ft
Find the area of each semicircle. Round to the nearest tenth. Use 3.14 for π.
10.
12.
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?
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.
Measure Figures
119