1. Areas of Trapezoids, Rhombuses, and Kites
May 9, 2003
Areas of Trapezoids, Rhombuses, and Kites
GEOMETRY LESSON 7-4
Pages Exercises
in.2
cm2
ft2
4. 110,622 mi2
cm2
ft2
7. about 43,290 mi2
8. 30 ft2 5 6
9. 72 m2 m2
ft2
in.2 m2
in.2 m2
ft2
ft2
ft2
in.2 m2
in.2
22. a.
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2. Areas of Trapezoids, Rhombuses, and Kites
May 9, 2003
Areas of Trapezoids, Rhombuses, and Kites
GEOMETRY LESSON 7-4
22. (continued)
b. 48 m
c. 120 m2
23. Check students’ work.
24. 9 cm2
cm2
cm2
ft2 m2
units2
units2
units2
units2 m2
34. a.
34. (continued)
b. trapezoid
c. 42 units2
cm2 m2
in.2
38. a. A = b1h; A = b2h
b. The area of the trapezoid is the sum of the areas of the triangles, so
A = b1h + b2h
= h (b1 + b2). 3 1 2 1 2 1 2 1 2 1 2
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3. Areas of Trapezoids, Rhombuses, and Kites
May 9, 2003
Areas of Trapezoids, Rhombuses, and Kites
GEOMETRY LESSON 7-4
39. b1 = 12 cm, b2 = 24 cm, h = 18 cm m2
or about in.2
42. A
43. H
44. C
45. D
46. B
47. [2] a. 
b. In the rt. shown, the other leg is 6. Since there are , the longer base is x and the shorter base is x.
160 = (8)(x + x + 12) and x = 14.
Bases are 14 cm and 26 cm.
[1] correct answer without explanation OR correct explanation and calculation error
in.2
units s 1 2
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4. Areas of Trapezoids, Rhombuses, and Kites
May 9, 2003
Areas of Trapezoids, Rhombuses, and Kites
GEOMETRY LESSON 7-4 cm
51. always
52. sometimes
53. never
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