How to create an arc with radius and 2 points in Sketcher 2D?

Hi! 

I want to create an arc with given radius and 2 points in Sketcher like:

LineArcRadius(color=Color['White'],
visibility=Visibility['VISIBLE'],
coordSys=CoordSys['FILLET'],
radius='MPR',
defPoint=[Point[pcounter-2],
Point[(pcounter-1)]],
nature=Nature['STANDARD'],
mesh=MeshLine['AIDED_MESHLINE'],
relaxation=RelaxLine['AIDED_RELAXLINE'])

But I cannot find the function in the tool bar:

and I cannot create a new line with type selection in Sketcher:

The work around is to go to the main window(?) or project area and create a new line:

Is this the normal process or what can I do in Sketcher to get access to all line features?

Thank you.

Frank M.