How much fence is needed to enclose the pool is called the circumference or perimeter of a circle.
[tex]c = \pi \times {r}^{2} [/tex]
In this case we got the Diameter which is equal to 2 times the radius
[tex]r = 32 \div 2 \\ = 16[/tex]
UNTO THE EQUATION
[tex]c = 3.14 \times 16 \\ = 50.24ft[/tex]
Therefore you would need 50.24 feet of wire to fence it!