Hi Francky,

re:
> 3/ Is it possible to create a circle with a precise radius, without clicking in the "d" window
> and entering the value there, for example, you draw your circle, then you press a short key,
> enter the value of the radius, and validate it with enter, and you are done.

Yes, like Pilou says above when you are in the Circle command at the step of picking the radius you can just type in your radius value and push Enter to specify the radius directly. When you start typing numbers keyboard focus will automatically go into the "Radius" field in the command options area in the upper right area of the window. You don't need to click anywhere just type in in your value.

If you want to enter in a diameter value you can click on the "Radius" label in the command options area to toggle it to diameter mode.

For your other question yes please post the .3dm model file.

- Michael