RailwayRouteOptimization/scripts/Draw/Circle/CircleConcentric/doc/CircleConcentric_proc_ru.html

<ol>
  <li>Enter the distance of the concentric circle from the original base circle
  in the options toolbar.</li>
  <li>Enter the number of concentric circles to create in the options
  toolbar.</li>
  <li>Click the base circle. The concentric circle(s) are created on that side
  on which the mouse cursor is located while clicking the base circle.</li>
</ol>