Answer:
The area of the octagon is [tex]A=202.8\ ft^2[/tex]
Step-by-step explanation:
we know that
The area of a regular polygon is equal to
[tex]A=\frac{1}{2}Pa[/tex]
where
P is the perimeter of the regular polygon
a is the apothem
we have
[tex]P=52.0\ ft\\a=7.8\ ft[/tex]
substitute
[tex]A=\frac{1}{2}(52)(7.8)[/tex]
[tex]A=202.8\ ft^2[/tex]