Centimeter is a measurement unit in the metric system. The diameter is not a measurement unit. The diameter of a circle is twice the length of the radius of the circle.
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To convert centimeters to inches, divide by 2.54.
There are infinite amount of diameters.
1 kilometer=100,000 centimeters
1 kilometer=100,000 centimeters
Only circles have diameters. I can't see the shape you're looking at, but if it has two different dimensions, then it's not a circle.