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Math 11 Chapter 12
Application of Trigonometry
Test - 9
1.
If the angles of a triangle are in the ratio 1 : 2 : 3, then the sides are in the ratio
a)
√
3
: 1 : 2
b) 1 : 2 :
√
3
c) 1 :
√
3
: 2
d)
√
3
: 2 : 1
2.
If 2 Sin A /2. Sin C / 2 = Sin B / 2 then a, b, c are in
a) H. P
b) G. P
c) None
d) A. P
3.
In any triangle ABC, if m < c = 60
0
then (a + b + c) (a + b – c) =
a) 2ab
b) 3ab
c) 3bc
d) ab
4.
In any triangle ABC 2b Cos
2
C/2 + 2c Cos
2
B/2 =
a) (a – b + c)
b) (a + b + c)
c) (a – b – c)
d) (a + b – c)
5.
The law of Cosines states that is a general triangle c2 = a2 + b2 …..
a) 2ab Cos r
b) 2ab Cos α
c) 2bc Cos α
d) ab Cos r
6.
The law of Cosines states that in a general triangle a2 = b2 + c2 ….
a) ac Cos ß
b) 2bc Cos α
c) 2ac Cos ß
d) 2ab Cos r
7.
In usual notations r
2
=
a) Δ / S – a
b) Δ / S – c
c) Δ / S
d) Δ/ S – b
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