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Problem
Problem
If
A
=
π
7
A = \frac{\pi}{7}
A
=
7
π
,
B
=
2
π
7
B = \frac{2\pi}{7}
B
=
7
2
π
and
C
=
4
π
7
C = \frac{4\pi}{7}
C
=
7
4
π
then in
Δ
A
B
C
\Delta ABC
Δ
A
B
C
,
a
2
+
b
2
+
c
2
R
2
\frac{a^2 + b^2 + c^2}{R^2}
R
2
a
2
+
b
2
+
c
2
equals to
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