Ok that's what it seemed to me also that it wasn't possible thank you anyway.
But another question on the same subject if I don't connect and I do but in a simple circle and if I make an arc between the 2 circles then I can't adjust my arc so that it is right on the circle. Is there a solution to create a block of my view for example so that I can fit the arc of the circle to the circle? Or better so that I can change the circle into a sketch entity to be able to make the adjustment?