1. PAKTURK Success is a ladder you cannot climb with your hands in your pockets 1
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CLASS
XI
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Composed by Engin Baştürk FEDERAL BOARD
TYPE Objective Application of Trigonometry No 3
Q1: Area of ABC is ......
A)
1
sin
4
ab  B)
1
sin
2
ab 
C) sinab  D) sinab 
Q2: Area of ABC is ......
A) 2 sin sin
2sin
a
 

B)
sin sin
2sin
a
 

C) 4 sin sin
2sin
a
 

D)
sin sin
2sin
 

Q3: Area of ABC is ......
A)
2 sin sin
2sin
b
 

B)
sin sin
2sin
b
 

C)
4 sin sin
2sin
b
 

D)
sin sin
2sin
 

Q4: Area of ABC is ......
A)
2 sin sin
2sin
c
 

B)
sin sin
2sin
c
 

C)
4 sin sin
2sin
c
 

D)
sin sin
2sin
 

Q5: ............R 
A)
2sin
a

B)
sin
a

C) sina  D)
sin
r

Q6: ............R 
A)
2sin
b

B)
sin
b

C) sinb  D)
sin
r

Q7: ............R 
A)
2sin
c

B)
sin
c

C) sinc  D)
sin
r

Q8: ............r 
A)
s

B)
s a


C)
s b


D)
s c


Q9: 1 ............r 
A)
s

B)
s a


C)
s b


D)
s c


Q10: 2 ............r 
A)
s

B)
s a


C)
s b


D)
s c



2. PAKTURK Success is a ladder you cannot climb with your hands in your pockets 2
Q11: 3 ............r 
A)
s

B)
s a


C)
s b


D)
s c


Q12: ............ 
A)    s a s b s c   B)    s s a s b s c  
C)    s s a s b s c   D)    s a s b s c  
Q13: Find the area of a triangle if 3cm, 4cm and 5cm
A) 6 B) 6 6 C) 6 2 D) 6 3
Q14: Which of the following is the area of an equilateral if
one side of the triangle is a cm?
A)
4
3
4
a
B)
2
3
4
a
C)
2
3
4
a
D)
2
3
2
a
Q15:
1 1 1
.............
ab bc ac
  
A)
1
2rR
B)
1
r
C)
1
rR
D)
1
R
Q16: Find R if 13a  , 14b  and 15c 
A) 8.13 B) 7.89 C) 8.90 D) 7.48
Q17: Find 1r if 13a  , 14b  and 15c 
A) 7.5 B) 8.5 C) 10.5 D) 9.5
Q18: Find 2r if 13a  , 14b  and 15c 
A) 10 B) 11 C) 12 D) 13
Q19: Find 3r if 13a  , 14b  and 15c 
A) 14.4 B) 14.2 C) 14 D) 13.12
Q20: Find 2
3
r
r
if 13a  , 14b  and 15c 
A)
11
14
B)
6
7
C)
7
6
D)
13
14
Answer Key
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20