centimeters or millimeters
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I would use a micrometer. A caliper would do as well.
If you were to calculate the mass of a nickel you would use grams or milligrams if you were to measure the diameter of a nickel you would use millimeters.
Millimeters.
Meter.... or more likely millimeters
Measure the perimeter of the wheel using a tape measure. Then use the formula to find out the diameter D = perimeter/3.14 ========================================== You could certainly do it that way. But it would be much more direct to just measure all the way across the wheel, between the two points on the edge of the wheel that are furthest apart. That would be the diameter.