Frenchy Pilou,

Those tips are very helpful. Thank you.

BurrMan,

I totally missed that radius property. Thank you. But still, in some cases the object is supposed to be a circle but it does not have a radius property.

Let me give you an example.

1. Create 2 circles.
2. Move one of them up in Z direction.
3. Create loft between them. There you have a cylinder.
4. Delete circles.
5. Select top or bottom edge boundary of the cylinder.
6. Copy and paste that boundary (Ctrl+C and Ctrl+V)
7. There you have a closed curve which looks identical to the circle we created at first step.

Radius property is missing. Why? This is what I'm talking about.