Creates an arc by defining the start point, a point on the arc, and the endpoint. This is a "generic" arc tool, because the local menu options enable you to define the arc in a number of different ways.
Select the start point. 
Select a point through which the arc will pass. 
Select the endpoint. 
Local Menu Options:
- Center: Before you click the arc start point, you can select Center to define the center point first.You can then click the center point and start point.
Rather than clicking the end point, you can select the Angle or Chord Length local option.
- End: With this option, after you click the arc start point, you can select End to click the end point.
Then you can click the center point, or use the Angle, Direction, or Radius local option.