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A diameter is the distance from one side of a spherical or circular object, through the centre, to the other. It can be as small as an atomic sub-particle or as large as a red super-giant star. There is absolutely no way that 6 millimetres can be "converted" to diameter.
You do a diameter circle!!
It is half of the diameter or radius = diameter/2
The cord of a circle that contains the center of that circle is a diameter of that circle.
The diameter is the measurement of a line that goes right through a circle, through the centre point. In cases where we have a ring or some other such object with multiple circles, we would have an external diameter and an internal diameter. The internal diameter is the diameter of the inner circle. The external diameter is the diameter of the outer circle.