First, you take the equation of the circumference of a circle which is: C=2πr
Next, you would plug in what you have. So right now you have the circumference. So 112=2πr.
Last what you would do is divide each side by πr so you would end up getting:
112/2π=r
By doing that equation, you would get the radius so you would just multiply your answer by 2.
The diameter is 351.86 inches