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Symbiosis National Aptitude Test SNAP 2019 Paper
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© examsnet.com
Question : 50
Total: 110
In the given diagram, ∠CAB = 60° and BC = a, AC = b and AB = c
Then which of the following connect?
a
2
=
b
2
+
c
2
– bc
a
2
=
b
2
+
c
2
– 2bc
a
2
=
b
2
+
c
2
+ bc
a
2
=
b
2
+
c
2
+ 2bc
Validate
Solution:
From cosine formula
cos (ϑBAC) =
A
B
2
+
A
C
2
−
B
C
2
2.
A
B
.
A
C
cos (60°) =
c
2
+
b
2
−
a
2
2.
b
.
c
1
2
=
b
2
+
c
2
−
a
2
2
b
c
a
2
=
b
2
+
c
2
– bc
© examsnet.com
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