> it won't work when 2 picks are both on the same line segment

I was not ! :)

Ok ok :)
I was perplex :)

I see - the tangent tool is for circle tangent to 2 curves of a specified radius.

When you move your mouse around, you are specifying a different radius all the time.

But in these cases there is only 1 possible radius that will work, that's why it looks like it isn't working, because if you ask for a circle of radius 1 unit for example, it cannot fit one in there.

But even if you get the right radius, I guess it still might not work because there are an infinite number of tangent circles of that radius that can slide between those 2 curves, I think it might not find it in this situation also.

- Michael

< But even if you get the right radius
Yes don't work inside the rectangle :)

And it's that which is pertubating because that works between these curves !

(infinite solutions too) (must be disable snap tot the grid)

Most of those don't have infinite solutions for one specific radius, except the top one if those are exactly concentric arcs...