The formula to find circumference of circle is given by :
[tex] C = 2\pi r [/tex]
Where r is radius of circle.
We are given radius as 4 units here.
Also we take pi as 3.14
plugging these values in the equation to find circumference,
[tex] C = 2* 3.14 * 4 [/tex]
C =25.12 units
So circumference of the circle is 25.12 units.