Question

Find the diameter given the circumference. Us 3.14 for Pi 78.5

Answer 1

assuming circumference is given and that is 78.6

c=pid
divide both sides by pi
c/pi=d

given
c=78.5
pi=3.14
78.5/3.14=d
25=d
diameter=25 units

Answer 2

So you use Pi x d for the circumference therefore you
Divide 78.5 by 3.14 which equals to 25