Final answer:
The circumference of a circle given a diameter of 5.7 is 5.7π. The formula used for calculation is C = πd.
Step-by-step explanation:
The student is asking to find the circumference of a circle when given the diameter. To find the circumference, we use the formula: C = πd, where C is the circumference and d is the diameter of the circle.
In this case, the diameter is given as 5.7. Plugging this into the formula, we get: C = π × 5.7.
Since the answer should be left in terms of π, we do not multiply out π but leave it as part of the answer. Therefore, the circumference of the circle is 5.7π.