Answer: 98 units
Step-by-step explanation: C=d x pi
Divide circumference by 3.14. You will get d=98
By definition, [tex]\pi[/tex] is the ratio between the circumference and the diameter:
[tex]\pi=\dfrac{C}{d}[/tex]
Which implies
[tex]d=\dfrac{C}{\pi}[/tex]
So, your diameter is
[tex]d=\dfrac{307.72}{\pi}[/tex]