Final answer:
The diameter is approximately 0.318 miles.
Step-by-step explanation:
To find the diameter, we can use the formula:
diameter = circumference / π
In this case, the circumference is given as 1 mile. Since we know that 1 mile is equal to 2πr in terms of the formula, we can rearrange the formula to find the diameter:
diameter = (1 mile) / π
Using the value of π as approximately 3.14, we can calculate the diameter as:
diameter = (1 mile) / 3.14
Therefore, the approximate diameter is 0.318 miles.