Answer:
12.874 cm
Explanation:
The circumference of a circle is: 
 , where r is the radius and d is the diameter.
 , where r is the radius and d is the diameter.
Here, we're given that the diameter is 4.1 and that we will use 3.14 for 
 . So, plug these in:
. So, plug these in:

Thus, the answer is 12.874 cm.
Hope this helps!