simultaneous X and PERP snap line to curve?

 From:  Frenchy Pilou (PILOU) 14 Mar 2013  (5 of 27) 
5767.5 In reply to 5767.4 
Just make a wheel zoom! And move your zoomed circle to the top screen before make anything! ;)

Or Make a first general perpendicular Help line, then zoom then draw your 62.2 Line whished

EDITED: 14 Mar 2013 by PILOU