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Math 11 Chapter 12
Application of Trigonometry
Test - 6
1.
A triangle which is not right angled is called.
a) Obtuse – angle
b) isosceles
c) Acute – angled
d) Oblique
2.
In triangle c2 = a2 + b2 – 2ab Cos r is called
a) Law of Cosines
b) Law of tangents
c) Law of Sine’s
d) None of these
3.
In any triangle, with usual notations, Sin á / 2 is equal to.
a)
√
(s + b) (s - c)
/ bc
b)
√
(s - a) (s - c)
/ ac
c)
√
(s - b) (s - c)
/ bc
d)
√
(s + b) (s + c)
/ bc
4.
In any triangle, with usual notations, Cos α / 2 is equal to.
a)
√
s (s – b)
/ ac
b)
√
s (s – a)
/ ab
c)
√
s (s – c)
/ ab
d)
√
s (s – a)
/ ab
5.
In any triangle, with usual notations, tan α / 2 is equal to.
a)
√
(s – b) (s – c)
/ s (s – a)
b)
√
(s – b) (s – c)
/ s (s + a)
c)
√
(s – a) (s – c)
/ s (s – b)
d)
√
(s – a) (s – b)
/ s (s – c)
6.
In any triangle, with usual notations, Sec α / 2 is equal to.
a)
√
ac
/ s (s – b)
b)
√
bc
/ s (s - a)
c)
√
ac
/ ( s – a ) (s – c)
d)
√
ab
/ s (s – c)
7.
A triangle has …. Important elements.
a) 4
b) 5
c) 3
d) 6
8.
In any triangle ABC, law of Sine’s is
a) Cos A = b2 + c+ a2 / 2bc
b) ½ ac Sin B
c) a / Sin A = b / Sin B = C / Sin C
d) A / Sin A = B / Sin B = C / Sin C
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