Respuesta :

Kaikerscupcake
Area= 2πr

So, 

If you were to multiply the radius by 2 since 2 is not in the equations, 

4*2= 8

8π ft^2 would be the correct answer.

I hope this helps!
~kaikers
grujan50
Formula for circles area is P= r^2 pi 
Therefore the correct answer is 16 pi ft^2.