Sketching a Fillet Arc

Note: You can only fillet elements that are created with the Line (this includes sides of polygons) or Arc sketch options.

1. Select a tool that allows for an arc.

   For example, click Annotate tabDetail panel (Detail Line).

2. Click Modify | Place Lines tab (or respective Modify | Place <Element> tab or Modify | Create <Element> tab)Draw panel (Fillet Arc), and place the cursor in the drawing area.
3. Select the first element to fillet.
   
4. Select the second element to fillet.
   
5. Move the cursor and click to define the fillet arc.
   

After you place the fillet, Revit automatically trims the elements to the fillet.