Use a caliper that's made for inside measurement.
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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.
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 !