8.3.10 Cercle (circle)



  \begin{texgraph}[name=cycloide,export=pgf]
  view(-5,5,-1,3),Marges(0,0,0,0),
  size(7.5), Seg(-5,5),
  for t in [-4,-1.85,0,1.85,3] do
    M:=t-sin(t)+i*(1-cos(t)),
    I:=t+i, DotStyle:=cross,
    Point(I), DotStyle:=bigdot,
    Point(M), Cercle(I,1), Seg(M,I),
    Arrows:=1, Arc(M,I,t,0.5,t),
    Arrows:=0, LineStyle:=dashed,
    Seg(I,t), LineStyle:=solid
  od,
  Width:=8,Color:=red,
  Courbe( t-sin(t)+i*(1-cos(t)))
  \end{texgraph}

 PIC



The cycloid