To find the circumference \( C \) of a circle, you can use the formula:
\[ C = \pi \cdot d \]
where \( d \) is the diameter of the circle.
Given that the diameter \( d \) is 5.75 miles and using \( \pi \approx 3.14 \), we can calculate the circumference:
\[ C = 3.14 \cdot 5.75 \]
Now, let's perform the multiplication:
\[ C = 3.14 \cdot 5.75 = 18.095 \]
Rounding this to the hundredths place, the circumference is:
\[ C \approx 18.10 \text{ miles} \]
So, the estimated circumference of the circle is 18.10 miles.