calculate the closest and the furthest values to a nominal diameter

I have plotted different circles with convergent diameters to a nominal value. I want to know which circle is the closest and the which one is the furthest from the nominal circle. I really really need your help

Answer 1

[Image Analyst]

Try this

differences = diameters - nominalDiameter;
[closestDiff, indexOfClosest] = min(differences);

[insaf]

that's work so good!! thank you so much I want to ask also, if it possible, how can I do the same but with squares? thank you again