import base_pi;
size(8cm,0);

path cle=yscale(3)*((0,0){N}..(1,0){N}..cycle);
draw(cle);

real x=.75;
/*<asyxml><view file="../base_pi.asy" type="real[]" signature="intersectsv(path,real)"/></asyxml>*/
real[] it=intersectsv(cle,x);
draw(subpath(cle,it[0],it[1]), 1mm+blue);
dot(intersectionpointsv(cle,x),red);
drawline((x,0),(x,1));