The circumference of a circle can be calculated using the following formula:

\[
C = 2 \pi r
\]

Where:
- \(C\) is the circumference,
- \(r\) is the radius of the circle, and
- \(\pi\) is a constant approximately equal to 3.14159.

Alternatively, if you know the diameter (\(d\)) of the circle, the formula becomes:

\[
C = \pi d
\]

Would you like a detailed example, or do you have any specific questions about this?

Here are 5 related questions:
1. How do you find the radius if the circumference is given?
2. What is the relationship between the diameter and the radius of a circle?
3. How does the area of a circle relate to its circumference?
4. What is the value of \(\pi\), and why is it important in circle calculations?
5. Can the circumference formula be applied to ellipses or other shapes?

**Tip:** Always remember that the diameter of a circle is twice its radius, so knowing one helps in finding the other.

Learn how to calculate the circumference of a circle using simple geometry formulas. This tutorial covers the relationship between radius, diameter, and π (pi) and provides clear examples for students in Grades 6-8.

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