Answer: 26.7 feet (choice D)
Work Shown
d = diameter
d = 8' 6" = 8 feet + 6 inches = 8.5 feet
C = circumference
C = pi*d
C = 3.14*8.5
C = 26.69
C = 26.7 feet
This is the approximate perimeter or distance around the circle. It's the amount of fencing needed to enclose the circle.
The value is approximate because pi = 3.14 is approximate.