The formula for the circumference of a circle is:

$C = \pi d$

where $d = 11$ cm.

$C = \pi \times 11$

Using $\pi \approx 3.1416$:

$C \approx 3.1416 \times 11$

$C \approx 34.56 \text{ cm}$

Answer: 34.56 cm

Would you like a step-by-step breakdown or any clarification?

Related Questions:

1. What is the circumference of a circle with a diameter of 20 cm?
2. How do you find the radius if you only know the circumference?
3. What is the formula for the area of a circle, and how is it derived?
4. If the radius of a circle is doubled, how does the circumference change?
5. How does the value of $\pi$ affect circumference calculations?

Tip:

If only the radius is given, use $C = 2\pi r$ instead!