2 times, you can fold it without no overlapping on any line
13 feet
Pythagorus is used
25 + 144 = 169
169 is 13 to the second power etc
What is 9 inches? Is 9 inches the diameter? Or the radius? What?
The equation for circumference is pi x diameter.
So assuming the 9 inches is the diameter:
Pi x 9 = 28.2743339
Circumference = 28.274 (3 d.p.)