15 ' 8 1/2" The length of the circumference of a 5' diameter circle is 5*pi feet or about 15.7' but as the diameter was only given with one significant figure the answer may only have one significant figure of accuracy so
2 times 101 feet
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The equation for determining the circumference of a circle is circumference = pi x diameter. So if the diameter is 5, then the circumference is pi * 5 = 15.71
2.52 feet if you mean a 5 foot area 1.59 feet if you mean a 5 foot circumference
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units
c = 15.7
About 1.6 inches.