Two lines drawn through a point on the circumference of a circle divided the circle into three regions of equal area.Then the angle $\theta$ between the line is given by

Question

$\begin{array}{1 1}(a)\;3\theta+3\sin\theta=\pi&(b)\;6\theta+3\sin\theta=\pi\\(c)\;2\theta+\sin\theta=\pi&(d)\;\theta+\sin\theta=\large\frac{\pi}{2}\end{array}$