AB is a chord of a circle S subtending an angle of $20^{\large\circ}$ at the centre.Suppose AB has length 1008 units and CD is another chord having length 1512 units,then the angle subtended by CD at the centre is

Question

$\begin{array}{1 1}40^{\large\circ}\\30^{\large\circ}\\60^{\large\circ}\\25^{\large\circ}\end{array} $