1. Geometric Probability
May 9, 2003
Geometric Probability
GEOMETRY LESSON 7-8
Pages Exercises 1. 2. 3. 4.
5. 1 6.
or 40% 1 2 3 5 10
or 50%
or about 27%
or about 57%
or about 33%
or about 47%
or 62.5%
14.
or 25% 1 2 4 15 7 3 5 8 6
16. 25%
or 40%
or about 67%
or about 61%
or about 21%
21. 4%
22. 6
23. 2 5 3
2 +
4 – 4
7-8

2. Geometric Probability
May 9, 2003
Geometric Probability
GEOMETRY LESSON 7-8
24.
25.
or about 16%
27. a. 14 prizes
b. $110
28. a. or 60% 4 10
200 3 5 s
30. about 5.6%
31. a.
If it starts after 45 min, you cannot erase 15 min of a
60-min tape.
31. (continued) b.
or about 16%
32.
33.
34.
35. 0
36. 7 45 3 5 10 9 20 1 40
7-8

3. Geometric Probability
May 9, 2003
Geometric Probability
GEOMETRY LESSON 7-8
37. 1
38.
40. about 46%
41. about 36%
42. about 58%
43. about 46%
44. a. yes        
b. no          
c.  2 3 10
10 – 2
45. a–b. Check students’ work.
46. a. 45 cm      
b. 63 cm       
c. 71 cm
d. 77 cm      
e. 89 cm       
f. 100 cm
%; the
probability is the same. 24 49
48. A
49. I
50. [2]
= = 60%
[1] no work shown OR correct explanation and a computational error
area of circle
area of triangle
(1)2
3 3
7-8

4. Geometric Probability
May 9, 2003
Geometric Probability
GEOMETRY LESSON 7-8 3 2 1
784
ft2
55. x = 36; y = 144
56. x = 45; y = 90
57. a. D(3, 1); E(1, 4)
b. slope DE = – ;
slope AC = –
c. DE and AC have the same slope.
d. DE = 13; AC =
e = •
51. [4] a. (area of circle) = ( • 282) = m2
b. Area of = bh = ( )(14) = ,
so area of segment = – m2;
the shaded area is the area of the 120° sector minus the area of the .
[3] one computational error OR incorrect explanation
[2] one computational error and incorrect explanation
[1] one correct answer OR a correct explanation
ft2
cm2
7-8