Respuesta :

Mistystar4881

Hey there!

[tex]\large\boxed{816ft^2}[/tex]

Formula for area of an octagon:

A = 2(1 + √2)a²

The variable a is side length.

Plug in 13 for a.

A = 2(1 + √2)13²

Simplify.

A = 2(1 + √2)169

A = 338(1 + √2)

A = 816 ft²

Hope this helps!

Answer:

A ≈ 816 ft²

Step-by-step explanation:

Just got a lucky guess on my quiz.  Hope this helps:)