Question 946742
Question part (d) is not clear.   The other three question parts are uncomplicated.


(a):
Just the pool top area,  {{{(pi)(4)^2=16pi}}}.


(b):
Combined area of pool and the 1-foot border,
meaning for total radius of {{{4+1=5}}};
{{{(pi)(5)^2=25pi}}}.


(c):
For just the border area, find the difference.