To make it easier, aprox pi=3.14 area=pir^2 36=area 36=pir^2 divide both sides by pi 36/pi=r^2 36/3.14=r^2 11.464=r^2 square root both sides 3.39=r
circumfernce=2pir r=3.39 circumfrence=2pi times 3.39 circumference=pi times 6.78 circumference=3.14 times 6.78 circumfernce=21.29 answer is circumference=21.29 in