6. Find the area of the regular octagon

A gift wrap when opened, resembles a regular octagon. Let the regular octagon be $ABCDEFGH$. If $AD =$ 39 $cm$, $BC =$ 25 $cm$, $BP =$ 24 $cm$ and $DE =$ 25 $cm$, find the area of the octagon formed.

 

 

The area of the octagonal gift wrap is  $cm^2$.