Answer:
The diameter of the circle is 18 miles.
Step-by-step explanation:
The diameter is the length from 1 point on the circle to another, going directly through the circle. A diameter is always 2 times the radius' length. Since the radius is 9 miles, we just need to multiply that by 2 to get the diameter. 9 x 2 = 18. Hope this helped!! :]
