There is chance to get the maximum size of a 2d shape (diameter??) as for red one:
Thanks in advance.
can you try giving a different example?
it’s not entirely clear (to me at least) what you’re asking.
Sounds like you want a minimum bounding box. I have a feeling there are several scripts around but don’t necessarily have the latest / best one around…
See if this one by @Helvetosaur gets what you need:
Scratch that idea. You want a maximum bounding box… 
Circle with the Tangent option seems like a possibility, but I still do not see how to hit the absolute largest one.
-Pascal
I need to have the maximum bounding box (max dimension) of the red shape.
I used 3 points circle but is not correct, as you can see I got different radius depending where I took the 3 points.
Measuring it is also not easy.
Many thanks in advance.
oh… i see… for whatever reason, i thought the red curve was 3D and it was confusing me 
so the largest linear dimension possible across the red curve… got it.
it seems Circle-> Tangent,Tangent,Radius snaps into the right place (click the first point anywhere along the curve then for the second point, move the cursor around the curve… there’s a point where it snaps and i think that’s the dimension you’re looking for?) however, i can’t seem to make it that radius stick upon completing the command
?
It looks like Circle Tangent may do the job on this type of curve. The second tangent point snaps to a diameter - Enter after clicking to place the second point to accept that circle.
http://screencast.com/t/ZRQbd0lh8
-Pascal
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right, that’s the same thing i was saying while we were posting at the same time… i can’t get the circle to draw at the end though… i’ll try again.
[edit- oh… i get it… don’t use tangent-tangent… just Circle- then tangent option]
Thanks 