From FreeCAD Documentation
- There are several ways to invoke the tool:
- Press the Hexagon button.
- Select the Sketcher → Sketcher geometries → Create hexagon option from the menu.
- Right-click in the 3D view and select the Create hexagon option from the context menu.
- Use the keyboard shortcut: G then P, then 6.
- For further steps see Sketcher CreateRegularPolygon.