Basic Mathematics for College Students

65. 
    
    
    
    66. 
        
    
    
    
    


66. 
    
    
    
    68. 
        
    
    
    
    

In Problems 69 and 70,. Find and.

69. 
    

70. 
    

In Problems 71 and 72, find and.

71. 
    

72. 
    

In Problems 73–76, find.

73. 
    
    
    
    74. 
        
    
    
    
    

5 cm

7 cm 7 cm

x cm

5 cm

9 cm

5 mm

x mm 5 mm

6 mm

x

37 °

10 mi 46 °

8 mi

y

x

AD

C

BE

ABC  DEC

55 °

11 m

14 m

19 °

y

x

A

B

C D

ABC  ABD

x y

12 in.

8 in.

5 in.

A

y

B

C

25 ° 135 °

20 °

D

x

E

F

80 °

2 yd

3 yd 4 yd

E

A B

C

x

y

F

D

ABC  DEF x y

31 °

31 °

X Y

Z Q

AB

DE

C

ABDE XYZQ 75. 76.

77. If in the figure below is parallel to ,
    will be similar to. Find.


78. If in the figure below is parallel to , will
    be similar to. Find.


79. If in the figure below is parallel to ,
    will be similar to. Find.


80. If in the figure below is parallel to ,
    will be similar to. Find.

H K

C

A B

x

12

6

18

ACB x

HK ABHCK

AB

C

D

x E 4

12

15

BAC x

DE CBEAD

T V

S U

R

x

3

2

12

TRV x

SU TVSRU

A B

C

D x E

5

12

10

DEC x

DE ABABC

5 in. 5 in.

50 °

x

7 in. 7 in.

7 in. 7 in.

50 °

x

9.5 Congruent Triangles and Similar Triangles 765