// import geometry_dev; // extension devenue l'extension geometry officielle
import geometry;        // le 12/05/09, dans la version 1.71 d'asymptote. :-))
import markers;
size(7.5cm,0);
show(currentcoordsys);
circle C=circle((0,0),1);
draw(C,.4bp+black);
point pA=curpoint(C,pi/4),
      pB=curpoint(C,-pi/3),
      pC=curpoint(C,5pi/6),
      pD=curpoint(C,-2pi/3),
      pE=curpoint(C,-pi/2),
      pF=curpoint(C,pi/6),
      pG=curpoint(C,-3pi/4),
      pH=curpoint(C,pi);      
pen p1=5bp+blue, p2=dashed;
dot(pA,p1); draw(pA--(0,0),p2);
dot("$-\frac{\pi}{3}$",pB,SE,p1); draw(pB--projection(Ox)*pB,p2);
dot("$\frac{5\pi}{6}$",pC,NW,p1); draw(pC--projection(Oy)*pC,p2);
dot(pD,p1); draw(pD--projection(Ox)*pD,p2);
dot(pE,p1); 
dot(pF,p1); draw(pF--projection(Oy)*pF,p2);
dot(pG,p1); draw(pG--(0,0),p2);
dot(pH,p1); 

markangle(Ox,Oy,StickIntervalMarker(2,3,size=2mm,space=1mm,true,gray));

draw((0,0)--(1,0),invisible,
     StickIntervalMarker(2,2,angle=45,size=2mm,space=1mm,gray));
draw((0,0)--(0,1),invisible,
     StickIntervalMarker(2,2,angle=45,size=2mm,space=1mm,gray));
draw((0,0)--(-1,0),invisible,
     StickIntervalMarker(2,2,angle=45,size=2mm,space=1mm,gray));

addMargins(.5cm,.5cm);