To calculate the diameter (d) of a circle using the formula \( d = \frac{C}{\pi} \), where \( C \) is the circumference and \( \pi \) is approximately 3.14, we can plug in the given values.
Given:
- Circumference, \( C = 28.26 \) ft
- \( \pi \approx 3.14 \)
Now, substitute the values into the formula:
\[ d = \frac{C}{\pi} = \frac{28.26}{3.14} \]
Now, perform the division:
\[ d \approx \frac{28.26}{3.14} \approx 9 \]
Therefore, the diameter \( d \) is approximately 9 feet.