A) p
B) \[2\pi /3\]
C) \[\pi /2\]
D) Zero
Correct Answer: B
Solution :
\[{{A}^{2}}={{a}^{2}}={{a}^{2}}+{{a}^{2}}+2{{a}^{2}}\cos \theta \Rightarrow \cos \theta =-\frac{1}{2}\Rightarrow \theta =\frac{2\pi }{3}\]
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