To find the circumference \( C \) of a circle using the formula:
\[ C = \pi d \]
Where \( d \) is the diameter of the circle. Given that the diameter \( d = 7 \) feet, we can substitute \( d \) into the formula:
\[ C = 3.14 \times 7 \]
Now, let's calculate it:
\[ C = 3.14 \times 7 = 21.98 \]
Therefore, the circumference of the circle is:
\[ C = 21.98 \text{ ft} \]