Final answer:
The circumference of the circle with a diameter of 6 kilometers is approximately 18.84 kilometers.
Step-by-step explanation:
To find the circumference of a circle, you can use the formula: C = πd, where C is the circumference and d is the diameter.
Given that the diameter of the circle is 6 kilometers, you can substitute this value into the formula to find the circumference: C = π(6) = 6π kilometers. However, if you want a numerical approximation, you can use the value of π as 3.14.
Therefore, the approximate circumference of the circle is 6π kilometers, which is approximately 18.84 kilometers.