Hello!
Judging by the question you have provided I figured that to find the circumference of the circle you need to first know the equation to do so!
The equation to find circumference is Diameter(π)=Circumference.
Thus, your equation should look something like this, 3(3.14)= Circumfrence.
If solved your answer should be 9.42 inchest!
Hope this helped!
-Blake