Given that; $A = B = C$. If $\vec A + \vec B = \vec C,$ then the angle between $\vec A$ and $\vec C$ is $\theta _1$. If $\vec A + \vec B+ \vec C = 0,$ then the angle between $\vec A$ and $\vec C$ is $\theta _2$. What is the relation between $\theta _1$ and $\theta _2$ ?

  • A

    $\theta _1=\theta _2$

  • B

    $\theta _1=\theta _2/2$

  • C

    $\theta _1=2\theta _2$

  • D

    None of these

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