Pre-Algebra Chapter 9

Standardized
Test Practice
36. WRITING IN MATH Answer the question that was posed at the beginning
of the lesson.
How are angles used in circle graphs?
Include the following in your answer:
• a classification of the angles in each section of the circle graph shown at
the beginning of the lesson, and
• a range of percents that can be represented by an acute angle and an
obtuse angle.
37. Which angle is an obtuse angle?
A
180˚
B
90˚
C
110˚
D
40˚
38. Which of the following is closest
to the measure of XYZ?
A 45°
X
40
140
50
130
60
120
70
110
80
100
90
100
80
110
70
60
120
50
130
140
40
B
C
D
55°
135°
145°
Z
20
160
10
170
30
150
Y
150
30
160
20
170
10
Maintain Your Skills
Mixed Review
Name all of the sets of numbers to which each real number belongs. Let
N natural numbers, W whole numbers, Z integers, Q rational
numbers, and I irrational numbers. (Lesson 9-2)
39. 5 40. 0.4 41. 63 42. 7.4
Estimate each square root to the nearest whole number. (Lesson 9-1)
43. 18 44. 79
Getting Ready for
the Next Lesson
45. Translate the sentence A number decreased by seven is at least
twenty-two. (Lesson 7-3)
PREREQUISITE SKILL Solve each equation.
(To review solving two-step equations, see Lesson 3-5.)
46. 18 57 x 180 47. x 27 54 180 48. 85 x 24 180
49. x x x 180 50. 2x 3x 4x 180 51. 2x 3x 5x 180
P ractice Quiz 1
Find each square root, if possible. (Lesson 9-1)
1. 36 2. 169
Lessons 9-1 through 9-3
3. ALGEBRA Solve m 2 68 to the nearest tenth. (Lesson 9-2)
Classify each angle measure as acute, obtuse, right, or straight. (Lesson 9-3)
4. 83° 5. 115°
www.pre-alg.com/self_check_quiz
Lesson 9-3 Angles 451