I drew a circle, added a diameter to it, joined objects, removed topmost anchor point...
Now I need to make it united shape:
The question is general and the situation is general: suppose I have exact parts of desired outline shape. I can't use any averaging or pen tool, because all anchor points are already in place. All I need is just declare some overlapped points pairs as single points.
Why can't I do that?
If I press Object -> Path -> Join I get a message