Answer: The circumference is 25.12 cm.
Explanation
The formula for the circumference of a circle is given to us as C = πd, where C means the circumference and d means the diameter. We are given the radius, which is 4 cm. We know that the diameter is 2r, or 2 times the radius. 4 · 2 = 8, which means the diameter is 8.
We are told to use π as 3.14, and so we can plug in our numbers.
C = (3.14)(8)
C = 25.12
The circumference of this circle is 25.12 cm.