Name ———————————————————————
Date ————————————
Practice A
LESSON
11.1
For use with pages 748–754
Find the area of the rectangle.
1.
2.
3.
3
8
9
4
15
5
Find the area of the parallelogram.
4.
12
5.
11
6.
16
LESSON 11.1
6
10
9
Find the area of the triangle.
7.
8.
9.
5
Copyright © Holt McDougal. All rights reserved.
6
14
16
8
7
Find the area of the polygon.
10.
10
11.
12.
9
7
6
8
12
13.
15
14.
4
4
4
8
15.
2 3
6
6
4
18
Geometry
Chapter 11 Resource Book
307
Name ———————————————————————
LESSON
11.1
Practice A
For use with pages 748–754
Date ————————————
continued
Use the Pythagorean Theorem to find the area of the polygon.
16.
17.
18.
20
13
10
12
12
30
19. You frame a mirror as shown at the right.
6
24 in.
LESSON 11.1
The width of each piece of the frame is
1 inch. Find the area of the frame.
28 in.
30 in.
22 in.
20. Kites Find the area of the kite.
21. Shuffleboard Find the area of the scoring area.
8
8
7
7
10
OFF
5 ft
6 ft
308
Geometry
Chapter 11 Resource Book
9 ft
1.5 ft
Copyright © Holt McDougal. All rights reserved.
10
Lesson 11.1
14. 960 square units
15. 672 square units
Practice Level A
16. 474 square units
17. 15; 30
3. 120 square units 4. 72 square units
18. 18 cm; 12 cm
5. 99 square units 6. 160 square units
19. 16; 64
7. 21 square units 8. 35 square units
20. w 5 6 in.; P 5 40 in.
9. 64 square units 10. 66 square units
21. 6; 150
11. 81 square units 12. 88 square units
22. 6; 90
13. 48 square units 14. 162 square units
}
15. 16 1 16Ï 3 square units 16. 30 square units
17. 192 square units 18. 144 square units
19. 104 in.2 20. 464 in.2 21. 35.25 ft2
1
Area of nJKL 1 Area of nJLM 5
1. 96 square units 2. 121 square units
1
2
3. 126 square units 4. 96 square units
9. 84 ft; 210 ft2 10. 198 in.; 1386 in.2
1
11. 9 12. 16 13. 38 14. 75 m2 15. 175.5 ft2
Area of n2 5 }2 (9)(4) 5 18
19. 1219 ft2
21.
The sum of the areas of both triangles is 30.
Now, use the formula:
y
2
(− 1, − 1))
1
A(2, 2)
D(4, 2)
1
P(− 4, − 4)
2
x
R(5, −4)
x
8 square units
13.5 square units
2
22. 8.485 in.; 169.706 in.
23. 9.526 m; 161.947 m2 24. 51.3 in.2
25. 17.5 ft2; 2520 in.2 26. $125
Practice Level C
1
1
Area: }2 h(b1 1 b2) 5 }2 (4)(6 1 9) 5 30.
The areas are equal.
}
26. First, use Heron’s Formula with s 5 4 1 2Ï 2 .
}}}
}
}
}
}
A 5 Ï (4 1 2Ï 2 )(2Ï 2 )(2Ï 2 )(4 2 2Ï2 )
}}}
}
}
}
5 Ï (4 1 2Ï 2 )(4 2 2Ï 2 )(2Ï 2 )2
}
}
5 Ï (16 2 8)(8) 5 Ï64 5 8
Now use the formula for the area of a triangle.
1
1
}
}
1. 180 square units 2. 288 square units
A 5 }2 bh 5 }2 (4Ï 2 )(2Ï 2 ) 5 8.
3. 52 square units 4. 14 cm 5. 6.5 m
The areas are equal.
6. 32 in. 7. P 5 40 ft; A 5 60 ft2
Review for Mastery
2
8. P 5 126 in.; A 5 630 in.
1. 126 square units 2. 220 square units
2
9. P 5 154 cm; A 5 924 cm
10. P 5 198 mm; A 5 1386 mm2
11. 48 square units
12. 40 square units
13. 20 square units
A50
Area of n1 5 }2 (6)(4) 5 12
1
16. 378 in.2 17. 484 cm2 18. 437 mm2
C(5, 6)
1
2
25. Sample answer: Divide the trapezoid into
2 triangles.
7. 60 cm; 120 cm2 8. 112 mm; 336 mm2
B(3, 6)
1
2
} b h 1 } b h 5 } h(b 1 b )
1
2
1
2
5. 142.5 square units 6. 45.5 square units
y
1
24. Sample answer: Area of nJKL 5 } b1h;
2
Area of nJLM 5 }2 b2h; Area of JKLM 5
Practice Level B
20.
23. 192 square units
Geometry
Chapter 11 Resource Book
3. 24 square units 4. x 5 7 5. 4930 ft2
Problem Solving Workshop:
Worked Out Example
1. 840 in.2 2. 26 in.2
Copyright © Holt McDougal. All rights reserved.
ANSWERS
1. 27 square units 2. 20 square units