Translations:Basic Sketcher Tutorial/13/en

From FreeCAD Documentation

6. Create an arc between each pair of the previous O-arcs.

6.1. Still with the Create arc tool active, click somewhere between two O-arcs but further away from the origin of the sketch, to set the center point of a new arc.
6.2. Click somewhere close to the endpoint of one O-arc, and move the pointer to sweep another arc finishing close to another endpoint of a different O-arc, as if you were trying to join the endpoints. This time the concavity must point away from the origin.
6.3. Repeat these steps, so that each pair of O-arcs has a new arc between them. We will call these I-arcs for inwards-arcs.