Another option of a drawing a circle is Center + Radius
After select this option, now you can specify the radius of a circle. Please enter a radius of the circle in the input bar and after that click OK.
Now, as before, you have to specify the position of the center of the circle. You can click whenever you want in the Alphacam workspace or you can enter the values of coordinates XY of the circle’s center.
Type X0 Y0. And you will get:
You can draw another circle or finish by clicking RMB or Esc.
Please see the video on YouTube