It depends what you know.
The top of a cylinder is in the shape of a circle. So, to find the diameter of the cylinder (which is also the diameter of the circle), if you know the radius, just multiply it by two.
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The diameter, alone, is not enough to find the volume of a cylinder. You need the height as well. > Where pi = 3.1416, and d = cylinder diameter cylinder volume = pi * (d/2)2 * length of cylinder
The radius is half the diameter.
Your diameter is double the radius. So the diameter is 6
The radius of the cylinder would be 0.64cm ! The radius is half the diameter - length has nothing to do with the question !
You cannot determine the height and diameter from just the volume because there is an almost infinite number of combinations of height and diameter that could create a particular volume.