3 point arc, center off screen

I want to make an arc, but radius is so large that to accurately see the second and third point, the center would be off screen.

How do you do this ?

You can just zoom in and out between selecting the center and second and third point. The center doesn’t have to be on screen.

In case you were not aware, the SketchUp user interface lets you click-and-release to set the first point, then freely move the mouse (while letting go completely, or zooming, orbiting, panning, etc.) to set the next point with a separate click-and-release action, etc.