Hi Francky, also in addition to just typing in the radius value while you are in the circle command, you can alter an existing circle's radius value by clicking on the Radius field in the properties panel that shows up when you select an object:





Similar to the circle drawing command, you can click on the "Radius" label on the edit size popup menu to toggle it to diameter mode. Also when the menu is launched you can just start typing in your new radius value without needing to click in the field first.

- Michael

Thank you all for your answer.

Regarding the 100 Radius Arc, I have understand why I was not able to do 100 precisely, it was because I had the snap to grid active, so of course according to the grid it was not possible to get 100.

@French_Pilou
for the 100 arc, I was doing it using the tan method, what is strange is that I could get 99.35 or 100.6 by drawing, but if I entered 100 as D value, the arc was completly different as the one I was drawing.

I will try it again to night.

Thank you all for your help.