[tex]\bf \textit{exterior angle of a regular polygon}
\\\\\\
\theta=\cfrac{360}{n}\qquad
\begin{cases}
\theta=\textit{the angle in degrees}\\
n=\textit{number of sides}
\end{cases}[/tex]
now, an OCTAgon, has OCTA=8, sides
an HEXAgon, has HEXA=6, sides
check what their external angles are, and compare :)