Page 671 - Basic College Mathematics with Early Integers

648 C HAPTE R 9 I GEOMETRY

Objectives Mixed Practice Find the distance around each figure. For circles, give the exact circumference and
then an approximation. Use p L 3.14. See Examples 1 through 8.

45. 9 mi 46. 47. 48.
4.5 yd
7 yd
4.7 mi
11 m
6 mi
9 yd 14 cm
11 mi

49. 50. 51. 7 ft 52. 44 mi
Regular Regular 19 km
Pentagon Parallelogram 8 ft
8 mm
40 mi
22 ft
9 mi
20 ft

Review

Simplify. See Section 1.9.
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53. 5 + 6 3 54. 25 - 3 7 55. (20 - 16) , 4 56. 6 (8 + 2)
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3
57. 72 , (2 6) 58. (72 , 2) 6 59. (18 + 8) - (12 + 4) 60. 4 1 # (2 - 8)
Concept Extensions

There are a number of factors that determine the dimensions of a rectangular soccer field. Use the table below to answer
Exercises 61 and 62.

Soccer Field Width and Length 61. a. Find the minimum length and width of a soccer
Width Length field for 8-year-old children. (Carefully consider
Age Min–Max Min–Max the age.)
Under 6/7: 15–20 yards 25–30 yards b. Find the perimeter of this field.
Under 8: 20–25 yards 30–40 yards
62. a. Find the maximum length and width of a soccer
Under 9: 30–35 yards 40–50 yards
field for 12-year-old children.
Under 10: 40–50 yards 60–70 yards
b. Find the perimeter of this field.
Under 11: 40–50 yards 70–80 yards
Under 12: 40–55 yards 100–105 yards
Copyright 2012 Pearson Education, Inc.
Under 13: 50–60 yards 100–110 yards
International: 70–80 yards 110–120 yards

Solve. See the Concept Check in this section. Choose the figure that has the greater distance around.

63. a. A square with side length 3 inches 64. a. A circle with diameter 7 inches
b. A circle with diameter 4 inches b. A square with side length 7 inches