[tex]\bf \textit{area of a sector of a circle}\\\\
A=\cfrac{\pi r^2 \theta }{360}\qquad
\begin{cases}
r=radius\\
\theta =angle~in\\
\qquad degrees\\
------\\
r=8\\
\theta =120
\end{cases}\implies A=\cfrac{\pi \cdot 8^2\cdot 120}{360}
\\\\\\
A=\cfrac{\pi \cdot 64\cdot 120}{360}\implies A=\cfrac{64\pi }{3}[/tex]
