To calculate the circumference of a circle, you can use the formula:
\[ C = \pi \times d \]
where \( C \) is the circumference and \( d \) is the diameter of the circle. Given that the diameter is 5.75 miles, we can substitute this value and use \( \pi \approx 3.14 \):
\[ C = 3.14 \times 5.75 \]
Now let's perform the multiplication:
\[ C = 3.14 \times 5.75 = 18.095 \]
To estimate the circumference to the hundredths place, we round 18.095 to two decimal places:
\[ C \approx 18.10 \text{ miles} \]
Therefore, the estimated circumference of the circle is 18.10 miles.