The image shows a problem where the radius $r = 4 \, \text{m}$ is given, and you need to find the circumference $C$ of a circle, using $\pi = 3.14$.

The formula for the circumference of a circle is:

$C = 2 \pi r$

Substituting the given values:

$C = 2 \times 3.14 \times 4$

Let me calculate that for you.The circumference $C$ of the circle is $25.12 \, \text{m}$.

Do you want more details or have any questions about this problem?

Here are 5 related questions you might find interesting:

1. What is the area of the circle if the radius is 4 m?
2. How would the circumference change if the radius doubled?
3. What if $\pi$ were approximated as 22/7 instead of 3.14? How would the result differ?
4. How can you calculate the diameter of a circle if you know the circumference?
5. What is the relationship between the circumference and the area of a circle?

Tip: Remember, for quick estimations, $\pi$ is often approximated as 3.14, but using more digits of $\pi$ (e.g., 3.1416) increases precision.