circumerence=2πr or 2 times π times radius we want to find diameter which is 2 times of radius
c=2(πr) using the associative property we can do 2(πr)=(2)(π)(r)=(π)(2r) and 2r=diameter so πd=circumference c=πd 9.42=πd π≈3.14 9.42=(3.14)(d) divide both sides by 3.14 3=d diameter=3 feet