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Exercise 9.2

5. 2

1

6.

4 2

3

7.

5

23

8.

3

2 2

17. 
    

    A 30 $,B 30 $ 18. A 30 $

    
    


18. 
    

$ $

2

1

, 7

2

1

A 37 B 21. θ 90 $ 22. θ 60 $ 23. θ 60 $ 24. θ 45 $ 25. 3

Exercise 10

7. 
   
   
   
   45. 033 metre (app.) 8. 34. 641 metre (app.) 9. 12. 728 metre (app.)
   
   
   
   


8. 10 metres


9. 
   
   
   
   21. 651 metre (app.) 12. 141. 962 metre(app.) 13. 83. 138 metre (app.) and
   
   
   
   

48 metre

14. 
    
    
    
    34. 298 metre (app.) 15. 44. 785 metre (app.) 16. (b) 259. 808 metre.
    
    
    
    

Exercise 11⋅ 1

1. a^2 : b^2 , 2. π: 2 , 3. 45, 60, 4. 20%, 5. 18 : 25, 6. 13 : 7, 8. (i)
   4

3

, (ii)

1

2

b^2 

ab

,

(iii)x r 2 abb^2 , (iv) 10, (v) ̧
¹

·

̈

©

§



c

c

a

b 1

2

, (vi)

2

1

, 2, 22. 3

Exercise 11⋅ 2

1. a 2. c 3. c 4. b 5. b 6. 24%, 7. 70%, 8. 70%, 9. a Tk. 40, b Tk.60, c Tk.

120, d Tk. 80, 10. 200, 240, 250, 11. 9 cm. 15cm., 21cm., 12. Tk. 315, Tk.

336, Tk. 360, 13. 140, 14. 81 runs 54 runs, 36 runs, 15. Officer Tk. 24000,

Clark Tk. 12000 bearer Tk. 6000 16. 70, 17. 44%, 18. 1% 19. 532 quintal,

20. 8 : 9, 21. 1440 sq.metre, 22. 13 : 12.

Exercise 12.1

1. Consistent, not dependent, single solution 2. Consistent, dependent,

innumerable solution 3. inconsistent not dependent, has no solution 4.

consistent, dependent, innumerable solution 5. consistent, not dependent,