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UPSC NDA II 2011 Mathematics Paper
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© examsnet.com
Question : 33
Total: 120
In any triangle
ABC
, the sides are
6
cm
,
10
cm
and
14
cm
. Then the triangle is obtuse angled with the obtuse angle equal to
150
∘
135
∘
120
∘
105
∘
Validate
Solution:
cos
C
=
a
2
+
b
2
−
c
2
2
a
b
=
36
+
100
−
196
2
(
6
)
(
10
)
=
−
60
120
=
−
1
2
cos
C
=
cos
120
∘
C
=
120
∘
.
© examsnet.com
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