There are none! The question doesn't make sense since diameter is simply the distance across a circle and can be recorded in any unit. It is not related to the unit of measure called a meter. However, there are 10 decimeters in a meter.
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This is an invalid question as a diameter is the distance across the midpoint of a circle.
There are infinite amount of diameters.
You've got the context wrong; the diameter is a line passing from side to side through the centre of a circle or sphere. So I can't answer you.
There are infinite diameters in a circle all of the same lengths.
pi or 3.14159265...
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