Specify the start point, end point, and arc radius. 
- Select a tool that allows for an arc. For example, click Annotate tab Detail panel Detail panel  (Detail Line). (Detail Line).
 
-  Click Modify | Place Lines tab (or respective Modify | Place <Element> tab or Modify | Create <Element> tab) Draw panel Draw panel  (Start-End-Radius Arc), and place the cursor in the drawing area. (Start-End-Radius Arc), and place the cursor in the drawing area.
- Click in the drawing area to specify the start point for the arc. 
- Move the cursor and click to specify the length of the chord. 
 Note: You can also use listening dimensions to specify the length of the chord. After you click in the drawing area to specify the start point, type a value for the chord and press Enter.  
- Move the cursor and click to define the arc. 
 Note: You can also use listening dimensions to specify the radius of the arc. Type a value for the radius and press Enter.