1. Perimeter, Circumference, and Area
GEOMETRY LESSON 1-7
1. 22 in.
2. 36 cm
3. 56 in.
4. 78 cm m
6. 48 in.
7. 38 ft cm ft
in. m
in. m yd cm
16.
14.6 units
17.
25.1 units
Pages 55–58  Exercises 1 2
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2. Perimeter, Circumference, and Area
GEOMETRY LESSON 1-7 1 3 9 64
ft2 or 192 in.2
in.2 or 3 yd2
ft2 of 162 in.2
cm2 or 0.8 m2
m2 or 57,000 cm2
,000 cm2 or 12 m2
ft2 or yd2 m2
ft2
in.2 m2
ft2 m2
ft2 m2
cm2
in.2 m2
yd2
18.
16 units
19.
38 units 1 8 2 3
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3. Perimeter, Circumference, and Area
GEOMETRY LESSON 1-7
cm2
in.2
41. a. 144 in.2
b. 1 ft2
c. 144; a square whose sides are 12 in. long and a square whose sides are 1 ft long are the same size.
42. a. 30 squares
b. 16; 9; 4; 1
c. They are =.
Post 1-10
48. Answers may vary. Sample: For Exercise 46, you use feet because the bulletin board is too big for inches. You do not use yards because your estimated lengths in feet were not divisible by 3. cm
cm2 cm m2
44–47. Answers may vary. Samples are given.
in.; 90 in.2
in.; 93.5 in.2
ft; 8 ft2
47. 8 ft; 3.75 ft2
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4. Perimeter, Circumference, and Area
GEOMETRY LESSON 1-7
52. a. Yes; every square is a rectangle.
b. Answers may vary. Sample: No, not all rectangles are squares.
c. A = ( ) or A =
tiles
units
units2
58. 1,620,000 m2 m
60. (4x – 2) units
61. Area; the wall is a surface.
62. Perimeter; weather stripping must fit the edges of the door.
54.
perimeter = 10 units
area = 4 units2
55.
perimeter = 16 units
area = 15 units2 P 4 P2 16 2
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5. Perimeter, Circumference, and Area
GEOMETRY LESSON 1-7 b.
c. 25 ft by 50 ft
63. Perimeter; the fence must fit the perimeter of the garden.
64. Area; the floor is a surface.
units2
66. a. base height area
1 98   98
2 96  192
3 94  282 :
47  6  282
48  4  192
49  2   98
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6. Perimeter, Circumference, and Area
GEOMETRY LESSON 1-7
67. a. 9
b. 9
c. 9
d. 9
units2
units2
70. (9m2 – 24mn + 16n2) units2
71. Answers may vary. Sample: one 8 in.-by-8 in. square + one 5 in.-by-5 in. square + two 4 in.-by-4 in. squares yd
73. 64
78. (15, 13)
units; (5.5, 5)
units; (1.5, 5.5)
units; (3, 5.5)
units; (–2, 3.5)
units; (1, 6.5)
units; (–2.5, –2)
85. 90
86. WI RI
units
units
89. 6 units
units 3a 20
25a2 4
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