\[Дано:\ \ 36{^\circ} \leq \angle A \leq 37{^\circ};\ \ \]
\[66{^\circ} \leq \angle B \leq 67{^\circ}.\]
\[Решение:\ \angle C = 180{^\circ} - \angle A - \angle B.\]
\[+ \left| \begin{matrix} 36{^\circ} \leq \angle A \leq 37{^\circ} \\ 66{^\circ} \leq \angle B \leq 67{^\circ} \\ \end{matrix} \right.\ \]
\[\text{\ \ }\overline{102{^\circ} \leq \angle A + \angle B \leq 104{^\circ}}\]
\[76{^\circ} \leq \angle C \leq 78{^\circ}.\]