\[Схематический\ рисунок.\]
\[Дано:\ \ \]
\[\angle BAD = 72{^\circ};\]
\[\angle BAK = \angle DAK\ :7.\]
\[Найти:\]
\[\angle BAK;\ \angle DAK.\]
\[Решение.\]
\[\angle BAD = \angle BAK + \angle DAK\]
\[72{^\circ} = \frac{\angle DAK}{7} + \angle DAK\]
\[504{^\circ} = \angle DAK + 7\angle DAK\]
\[8\angle DAK = 504{^\circ}\]
\[\angle DAK = 63{^\circ}.\]
\[\angle BAK = \frac{63{^\circ}}{7} = 9{^\circ}.\]
\[Ответ:\ \ \angle BAK = 9{^\circ};\ \]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \angle DAK = 63{^\circ}.\]