Finding by Algorithm the smallest circle that will encompass a group of shots

[Turnup]

Does he not need some indication of how the axes are scaled to get the relative size of the target picture correct?

Well maybe yes and maybe no.


If results are required in units of distance then it will be necessary to know the scaling applied to the axes.


A perfectly correct result could also be produced in units of the existing x, y scales. E,g, group centre is at x 23.985, y 79.12 and group size is 15.1

This all falls apart if the x and y scale units are not the same though, but the data would then need to be scaled into common units OR for the really dedicated the "circle" generated could be substituted with an ellipse of appropriate scaling.