Calm down.
The area of a circle is defined by the following formula:
[tex]A=\pi r^2[/tex]
where π is a constant roughly equal to 3.1415 and r is the radius of the circle.
The radius is given as *4 ft*, so just plug it into the formula.
[tex]A=\pi (4)^2\\\\A=16\pi = 50.2655 ft^2[/tex]
