\[\left\{ \begin{matrix} x^{2} + y^{2} \leq 36 \\ y \leq |x|\text{\ \ \ \ \ \ \ \ \ \ \ \ } \\ \end{matrix} \right.\ \]
\[Сектор\ круга\ радиусом\ 6.\]
\[S = \frac{6^{2}\pi}{4} \cdot 3 = 27\pi.\]
\[Ответ:сектор;27\pi.\]