The coordinates of center of mass of uniform lamina shown in figure is

Question

$\begin{array}{1 1} (0,\large\frac{a}{3}) \\ (\large\frac{a}{6},0) \\ (\large\frac{-a}{6},\frac{a}{3}) \\ (\large\frac{-a}{6},0) \end{array} $