Parent page: PCB Dialogs

The Arc dialog


The Arc dialog provides controls to specify the properties of an Arc object. An Arc is a primitive design object that is used to create curved shapes on a single layer of a PCB. This could include curved corners in the routing, a circular ring on the component overlay, or a curved edge on a keepout zone.


The dialog can be accessed during Arc placement by pressing the Tab key.

After placement, the dialog can be accessed in the following ways:

  • Double-click on an Arc object.
  • Place the cursor over an Arc, right-click then select the Properties command from the context menu.


  • Radius - The radius of the Arc measured from the center point to the center of the Arc line.
  • Width - The width of Arc line.
  • Start Angle - The start angle of the Arc measured from the X axis in the first quadrant (plane geometry).
  • End Angle - The end angle of the Arc.
  • Center X/Y - The X/Y location of the Arc center.


  • Layer - The layer on which the Arc is placed. Arcs can be placed on any layer other than the system layers.
  • Locked - Enable to lock the object so that it cannot be edited graphically. A locked object cannot be selected or edited.
  • Net - If the Arc is a copper object, choose a Net for the Arc. All Nets in the current project will be listed in the drop-down list.
  • Keepout - Check this box to set the Arc object to act as a Keepout object. A Keepout object is displayed in the layer color and is outlined in the Keepout color. A keepout object is used on a signal layer to create a layer-specific keepout. Layer-specific keepouts are not included during output generation.

To toggle the units of measurement used in the open dialog between metric (mm) and imperial (mil), press the Ctrl+Q shortcut. This affects the dialog only and does not change the actual measurement unit currently employed for the board as determined by the Home | Grids and Units | Metric or Imperial setting.

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