To find the circumference of a circle, you can use the formula:

$C = 2 \pi r$

where:

• $C$ is the circumference,
• $\pi$ is approximately 3.14,
• $r$ is the radius of the circle.

If you provide the radius or diameter of the circle shown in the image, I can calculate the circumference for you. Could you specify the radius or diameter?

Would you like more details or explanations? Here are related questions for practice:

1. How do you find the radius of a circle if the circumference is known?
2. What is the area of a circle with a radius of 5 units?
3. How does changing the radius affect the circumference?
4. How would the formula for circumference change if given the diameter instead?
5. What is the difference between the circumference and the perimeter of a polygon?

Tip: Remember that if you know the diameter, you can calculate the radius by dividing the diameter by 2.