JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Modify Arc Angle Used to extend or shorten the length (sweep angle) of an arc. You can access this tool from the following: Ribbon: Drawing > Home > Placement > Arc Tools split button Toolbox: Arcs Key-in: MODIFY ARC ANGLE To Modify an Arc's Sweep Angle Parent topic: Arcs Toolbox