(a)[3]
Show that $\triangle ABC\cong\triangle BAD$. Provide a reason for every statement you make.
(b(i))[2]
In part (a), two tangents, $TC$ and $TD$, are drawn to the circle. The circle has diameter $8$ cm and $\angle ABD = 28^\circ$. Find $\angle CÔD$.
(b(ii))[5]
Calculate the area of the shaded region in the diagram.