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Problem
Problem
If
a
,
b
,
A
a, b, A
a
,
b
,
A
be given in a triangle and
c
1
c_1
c
1
and
c
2
c_2
c
2
two possible values of third side such that
c
1
2
+
c
1
c
2
+
c
2
2
=
a
2
c_1^2 + c_1 c_2 + c_2^2 = a^2
c
1
2
+
c
1
c
2
+
c
2
2
=
a
2
, then
A
A
A
is equal to a.
30
∘
30^\circ
3
0
∘
b.
60
∘
60^\circ
6
0
∘
c.
90
∘
90^\circ
9
0
∘
d.
120
∘
120^\circ
12
0
∘
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