The formula to calculate the area of a regular octagon is given to be:
[tex]Area=\frac{1}{2}\times apothem\times perimeter[/tex]
The image provided gives the following parameters:
[tex]\begin{gathered} apothem=26.6 \\ side\text{ }length=22 \\ Perimeter=2\times22=176 \end{gathered}[/tex]
Therefore, the area will be:
[tex]\begin{gathered} Area=\frac{1}{2}\times26.6\times176 \\ Area=2340.8 \end{gathered}[/tex]
Therefore, the appoximate area is
