Hi, I have a question about radius.

1/ Is it possible to express the radius as a diameter on the drawing (green rectangle) ?

2/ How can you do the arc (red rectangle) radius precisely 100 ? I have tried several time, and could not the best was 100.6 or 99.3(, I could not get a value in between, and when I enter 100 in the radius window, I don't get this arc at all.

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.