What am I doing wrong? I am trying to fit a three point circle to [10,10], [30,15], [40,30]. QCAD does happily so with centre [14,36.5] and r = 26,800187. This has been independently verified (r = 26,800186566515) However, what appears on the display is a circle that seems slightly larger, and does not go through the points exactly when one zooms in. I can clamp a radial line to the circumference, which shows the same gap, although the numeric length is again given as exactly r. What am I doing wrong, or is there a numerical/scaling/display issue with circles? Could send you a screenshot if it helps. [win7 64 QCAD 3.0.5]

Thanks.