Cycloid curve

 From:  Frenchy Pilou (PILOU) 3 Sep 2013  (13 of 40) 
6149.13 
Seems number 17 gives the construction by Points ! ;)
M3 = perpendicular at the M Point
MT = Tangentcy to at the M Point
Cd= C'M

EDITED: 3 Sep 2013 by PILOU