9.2 Geometry pg. 521
Finding the area.
160.4 m
40 m
36m27 m
9 m
Find the area of the large rectangle minus the area of the small rectangle.
40 x 36 – 27 x 9
35. A lot is 40 m by 36 m. A house 27 m by 9 m is built on the lot. How much area is left for a lawn?
1440 - 243
1197 m2
1197 m2
L x W – L x W
40. A standard sheet of typewriter paper is 8 ½ in. by 11. We generally type on a 7 ½ in. by 9 in. area of paper. What is the area of the margin?
8 1/2
11
7 1/2
9
Find the area of the larger rectangleminus the area of the smaller rectangle.
8.5 x 11 – 7.5 x 9
93.5 – 67.5
26 in2
26 in2
L x W – L x W
43. Find the area of the shaded region.
4 cmS2 x 5
Find the area of the squares.
42 x 5
16 x 5
80 cm2
11 mm
12.5 mm
2 mm
3 mm
5 mm
44. Find the area of the shaded region.
Find the area of the larger rectangle minus the area of the smaller rectangle.
12.5 x 11 – 5 x 6
6
11-5 6
137.5 - 30
107.5 mm2
L x W – L x W137.5- 30.0107.5
30 cm45. Find the area of the shaded region.
Find the area of the square minus the area of the triangle.
S2 – ½ BH30 x 30 – ½ (30) (15)
900 – (15) (15)
900 - 225
675 cm2
30 cm
30 cm
15 cm
46. Find the area of the shaded region.
12 in.
2 in.
6 in.4 in.
3 in. 3 in. 2 in.
Area of the rectangle minus area of small triangle minus area of large triangle.
L x W – ½ BH – ½ BH
12 x 6 – ½ (3) (2) – ½ (4) (4)
72 – (3) (1) – (2) (4)
72 – 3 - 8
61 in2
24
4
12 in.
Try numbers 48 and 50.
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