Question

I don't understand how to find m

Answer 1

`\Delta OCD` is isosceles with
`\overline{OC} \cong \overline{CD}`, we know
`m\angle COD=m\angle CDO=42^(\circ)`.

Using the sum of the angles in a triangle, it follows that
`m\angle OCD=\boxed{96^(\circ)}`.