The default way to draw arcs in AutoCAD is more or less in freehand style. This freedom is nice but it is very likely the arc will not have a round value for the radius. In a well-organized drawing however the radii have proper round values. With the 'Round Off Arc radius' command you can select the arcs which radius you want to round off. Once selected the command suggests a rounded off value for the arcs and when the radius is set it will redraw the arc. It can redraw it in three ways. By default the command will match the start and end point of the new arc with the selected arc. It can also match the mid points or the center points, whatever you prefer. The new arc is drawn on the layer of the selected arc. The selected arc will by default be erased. You can specify the number of decimals the command should round the radius of to. When the continuous setting is enabled you can continue to select arcs.