To find the circumference \( C \) of a circle with a radius \( r \) of 11 feet using the formula \( C = 2\pi r \), we can substitute the given values into the formula.
Using \( \pi \approx 3.14 \):
\[ C = 2 \times 3.14 \times 11 \]
Now, calculate the value:
\[ C = 2 \times 3.14 = 6.28 \]
Then multiply by 11:
\[ C = 6.28 \times 11 = 69.08 \]
Thus, the circumference \( C \) of the circle is:
\[ C = 69.08 \text{ ft.} \]