Basic Mathematics for College Students

NOTATION

Fill in the blanks.

35. The symbol is read as “ AB.”


36. The symbol is read as “ AB.”


37. The symbol is read as “ AB.”


38. We read as “the of segment AB.”


39. We read as “ ABC.”


40. We read as “the of angle ABC.”


41. The symbol for is a small raised circle, °.


42. The symbol indicates a angle.


43. The symbol is read as “is to.”


44. The symbol l 1 can be used to name a line. It is read as
    “line l one.”

GUIDED PRACTICE

45. Draw each geometric figure and label it completely.
    See Objective 1.
    a. Point T

b.

c. Plane ABC

46. Draw each geometric figure and label it completely.
    See Objectives 2 and 3.
    a.

b.

c.

d.

47. Refer to the figure and find the length of each
    segment.See Objective 2.

a. b.

c. d.

48. Refer to the figure above and find each midpoint.
    See Objective 2.
    a. Find the midpoint of.
    b. Find the midpoint of.
    c. Find the midpoint of EA.

BE

AD

DC EA

AB CE

AEBCD

23456789

L

XYZ

PQ

¡

RS

JK

·





m(ABC)

ABC

m(AB)

AB

¡

AB

AB

·

Use the protractor to find each angle measure listed below.

See Objective 4.

49. 
    
    
    
    50. 
        
    
    
    
    


50. 
    
    
    
    52. 
        
    
    
    
    


51. 
    
    
    
    54. 
        
    
    
    
    


52. 
    
    
    
    56. 
        
    
    
    
    

Classify the following angles in the figure as an acute angle, a

right angle, an obtuse angle, or a straight angle.See Example 1.

57. 
    
    
    
    58. 
        
    
    
    
    


58. 
    
    
    
    60. 
        
    
    
    
    


59. 
    
    
    
    62. 
        
    
    
    
    


60. 
    
    
    
    64. 
        
    
    
    
    

Find. See Example 2.

65.

66.

67. 
    
    
    
    68. 130 °
    
    
    
    

x

40 °

50 °

22.5°

x

112° x

168°

45 °

55 °

x

x

O

S

MPQN

QPO MNQ

MPQ PNO

NOP POS

MNO OPN

10090

80

10080 70

11012060

13050

14040

15030

16020

(^17010)
(^1800)
(^11070)
(^12060)
(^13050)
(^14040)
(^15030)
(^16020)
17010
1800
C D E
A
R
G
S
m(CDG) m(CDS)
m(CDR) m(CDA)
m(EDS) m(EDR)
m(GDE) m(ADE)
722 Chapter 9 An Introduction to Geometry