Sketcher > Creating Sketcher Geometry > To Create a Concentric Arc
  
To Create a Concentric Arc
1. Click Sketch and then click the arrow next to Arc.
2. Click Concentric.
3. Select one of the following entities as a reference:
Arc
Arc center point
Circle
Circle center point
A concentric construction circle is created.
4. Drag the construction circle to the desired radius and click to place it.
5. Select the first arc endpoint. The construction circle is removed.
6. Select the second endpoint. The arc is created.