\[\boxed{\mathbf{1438}\mathbf{\ (1030)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\angle AOB = 90{^\circ} - прямой.\]
\[1)\ \angle AOC = 90\ :5 = 18{^\circ}.\]
\[2)\ \angle BOC = 18 \cdot 4 = 72{^\circ}.\]
\[Ответ:\ \ 18{^\circ}\ и\ 72{^\circ}.\]