9. Exercise problems IV

In the given figure, $\Delta ODC \sim \Delta OBA$, $\angle BOC = 125^\circ$ and $\angle CDO = 70^\circ$. Find $\angle DOC$, $\angle DCO$ and $\angle OAB$.

 

 

$\angle DOC$ $=$ $^\circ$

 

$\angle DCO$ $=$ $^\circ$

 

$\angle OAB$ $=$ $^\circ$