Answer:
81.64ft
Explanation:
The length of the fencing material is the circumference
Circumference = 2πr
r is the radius = 13ft
π = 3.14
Substitute
Circumference = 2(3.14)(13)
Circumference = 26 * 3.14
Circumference = 81.64ft
Hence the required length is 81.64ft