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Practice B
8-4 Area of Parallelograms
Find the area of each rectangle.
1.
2. 4 mm
6.4 yd
3 yd
4.
3.
15.8 cm
6 cm
9 mm
5.
6.
8 ft
18
7.3 in.
1
m
2
13.7 in.
13 ft
7
1
m
2
Find the area of each parallelogram.
7.
8.
7 yd
9.
13 cm
5.8 ft
12 cm
7.2 ft
9 yd
11 cm
10.
11.
2.5 m
6m
1
3 3 in.
12.
5.6 m
1
10 2 in.
2.8 m
13. A dollar bill is 15.5 cm long and 6.5 cm wide. What is the area of
a dollar bill?
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Holt Middle School Math
Course 2
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Practice C
8-4 Area of Parallelograms
Practice B
8-4 Area of Parallelograms
LESSON
LESSON
Find the area of each rectangle.
Find the area of each rectangle.
1.
2. 4 mm
6.4 yd
3.
3 yd
36 mm2
104 ft
5.
100.01 in
135 cm2
7. rectangle: ! ! 29 in., w ! 15 in.
5.8 ft
12 cm
2
132 cm
2
66 ft
Sketch the figure with the given vertices. Then find the area of
the figure.
5.6 m
12. (2, 0), (5, 3), (8, 0), (11, 3)
11. (3, "2), (8, "2), (3, 6), (8, 6)
1
10 2 in.
15 m2
1
10. parallelogram: b ! 5!2! ft, h ! 12 ft
301 cm
41.76 ft
12.
28.8 m2
1
9. rectangle: ! ! 21 cm, w ! 14!3! cm
2
3 3 in.
6m
2.8 m
35 in.2
18 units2
40 units2
14. ("1, "2), (4, "2), ("1, 5), (4, 5)
13. ("4,1), ("9, 1), (0, 7), ("5, 7)
15.68 m2
35 units2
30 units2
13. A dollar bill is 15.5 cm long and 6.5 cm wide. What is the area of
a dollar bill?
15. What is the length of the base of a parallelogram with an area of
36 cm2 and a height of 4.5 cm?
100.75 cm2
8 cm
38
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Holt Middle School Math
Course 2
39
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Reteach
8-4 Area of Parallelograms
Gonzalez Builders purchased the four lots shown below. The
company intends to build homes on the lots and needs to know the
total area in square feet of each lot. They also need to know the
perimeter in feet of each lot.
5
w
3
!
You can count the squares inside the
rectangle. There are 15 square units
within the rectangle. This is equal to 5 • 3.
You can use proportions to calculate the areas and perimeters. For
each figure, the scale is 1 inch: 60 feet.
To find the area of a rectangle, multiply
the length (!) times the width (w).
A!!•w
0.5 in.
1 in.
1.5 in. Lot A
1.
2.5 in.
3 in.
Find the area of each rectangle.
1.5 in.
5 in.
7 yd
9
7
63
The area is
yd2.
A!
12
A!
60
1. total area
5
•
12,600 ft2
540 ft
perimeter
in2.
1 in.
To find the area of a parallelogram, multiply the base b times the
height h.
1.75 in.
2.5 in.
9 cm
8 yd
A!b•h
8
A!
32
The area is
3. total area
6 cm
perimeter
A!b•h
•
4
32
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yd2.
A!
6
A!
54
The area is
40
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•
9
54
0.5 in.
1 in.
1 in.
1.25 in.
4.
1.75 in.
Lot D
0.5 in.
1.5 in.
4 yd
690 ft
perimeter
Lot C
0.75 in.
Find the area of each parallelogram.
21,600 ft2
2 in.
A!b•h
A!
2. total area
2 in.
60
The area is
3.
0.75 in.
3 in.
A!l•w
•
1 in.
0.5 in.
0.75 in.
2 in.
12 in.
9 yd
A!l•w
1.5 in.
Lot B
1 in.
2.
63
Course 2
LESSON
The area of a figure is the number of square units inside the figure.
A!
Holt Middle School Math
Challenge
8-4 Size It Up!
LESSON
A!
21 yd2
8. parallelogram: b ! 8 m, h ! 3.6 m
435 in2
2
1
5.04 m2
Find the area of each figure.
11 cm
2.5 m
4 3 yd
2.1 m
7.2 ft
11.
4 2 yd
2.4 m
2
9 yd
63 yd
2.6 m
2
13 cm
10.
6.
1
9.
2
3
ft
4
46 ft2
15 cm
3
8.
7 yd
5
18 in.2
9 cm
Find the area of each parallelogram.
7.
7.2 in.
4.
13.7 in.
138!4! m2
2
8 ft
Find the area of each parallelogram.
7.3 in.
13 ft
1
m
2
3.
124.8 yd2
6.
1
18 m
2
7
8 yd
94.8 cm2
5.
8 ft
2. 2.5 in.
15.6 yd
6 cm
9 mm
19.2 yd2
4.
1.
15.8 cm
3 in.
2
13,950 ft
4. total area
540 ft
23,400 ft2
perimeter
5. What is the combined area of all four lots?
71,550 ft2
6. What length of fencing would be needed to
enclose all four lots during construction?
2,460 ft
690 ft
cm2.
Holt Middle School Math
Course 2
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
99
41
Holt Middle School Math
Holt Middle School Math
Course 2
Course 2