SHORT ANSWER
2.801
STEP BY STEP SOLUTION
The formula to find circumference is C=d*pi (Pi stands for pi or 3.14) D is the diameter
But a easier way to find circumference with the radius is to use this formula
C=2r*pi
Plug in those and you get C=2(4.4)*pi
4.4 times 2 is 8.8
And 8.8*pi is 2.801