Final answer:
The circumference of the circle is approximately 18.84 miles.
Step-by-step explanation:
To find the circumference of a circle, we can use the formula C = π × d, where C is the circumference and d is the diameter.
In this case, the diameter is given as 6 miles, so we can substitute this value into the formula: C = π × 6.
Approximating π to 3.14, we have C = 3.14 × 6 = 18.84.
Rounding this value to the nearest hundredth, the circle's circumference is approximately 18.84 miles.