Areas Of Irregular Shapes Worksheet Page 2
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11Lesson 12
121¬ ¬
Grass
Macorkel Construction built a house
68¬ ¬
with a driveway on a quarter-acre lot,
House
32¬ ¬
and seeded the rest with grass. How
90¬ ¬
many square feet had to be seeded?
For this problem, find the area of the
Driveway
40¬ ¬
house plus the driveway. Then subtract
that amount from the area of the lot.
14¬ ¬
Area of House
Area of Driveway
Area of Irregular part
Area of Lot
Seeded Part
A = lw
A = lw
2 , 1 7 6
A = lw
1 0 , 8 9 0
+
5 6 0
– 2 , 7 3 6
A = 68 × 32
A = 40 × 14
A = 121 × 90
2 , 7 3 6
8 , 1 5 4
A = 2,176
A = 560
A = 10,890
The area to be seeded is 8,154 ft
.
2
Subtract the area of
the white rectangle
from the area of the
Find the areas. Show your work.
larger rectangle.
22 mm
7 m
44 mm
21 m
14 m
11 mm
11
42 m
mm
1. a.
b. area of shaded part
48
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