I see it and strictly speaking, you are right; in this scenario there is no true tangent in a 3D sense.
Is there a way to force an “Apparent” tangent from (say) the top view only ? (Maybe that’s what my brain was going for subconsciously). It seems the Circle TTT is using the apparent view to draw its dynamic suggestions in the first place, can we make that official somehow and allow to specify a radius exactly ?
This idea came up while trying to fillet these edges. I did it using other methods, but I thought it would be interesting to have an apparent-tangent-fillet-something thing.
fillet.3dm (238.3 KB)