need help on precalculus

Answer:
around 502.65
Step-by-step explanation:
so, find the area of the circle first which is 16ft x 16ft x pi
after that, since a circle is 2 pi radians, just take 5/4 ÷ 2
then multiply that number over your area.
I'm not sure if I'm correct but this is what I know based on my limited understanding of it