To calculate the circumference of a circle, you can use the formula:
\[ \text{Circumference} = \pi \times \text{diameter} \]
Given that the diameter is 5.2 miles and using \(\pi \approx 3.14\), you can substitute the values:
\[ \text{Circumference} = 3.14 \times 5.2 \]
Now, perform the multiplication:
\[ 3.14 \times 5.2 = 16.328 \]
To estimate the circumference to the hundredths place, you round 16.328 to:
\[ 16.33 \]
Thus, the estimated circumference of the circle is 16.33 miles.