A circle has a circumference of 31π centimeters. What is the diameter, in centimeters, of the circle?

Answer (Detailed Solution Below) 31 - 33

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The correct answer is 31.
The circumference of a circle is equal to 2πr centimeters, where r represents the radius, in centimeters, of the circle, and the diameter of the circle is equal to 2r centimeters.
It's given that a circle has a circumference of 31π centimeters.
Therefore, 31π = 2πr.
Dividing both sides of this equation by π yields 31 = 2r.
Since the diameter of the circle is equal to 2r centimeters, it follows that the diameter, in centimeters, of the circle is 31.

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