File: directrix.euk

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xeukleides 0.9.2rev2-1
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% Directrix
% Copyright (c) Christian Obrecht 2001

x interactive(3,.2,"B",right)
y interactive(2,.2,"B",up)
r interactive(2,.1,"A",up)
d interactive(-90,1,"A",right)
e interactive(1,.1,"C",right)

F = point(x,y)
C = circle(F,r)
D = line(C,d:)
Co = conic(F,D,e)

draw(Co)
color(blue)
draw(F) ; draw(D)