Diagonales d'un quadrilatère complet
Author: Patrice Debart

A = (1, -4)
B = (6, -2)
C = (5, 0)
dAB = Line(A, B)
D = (3.5, 0)
dCD = Line(D, C)
dAD = Line(A, D)
dBC = Line(B, C)
E = Intersect(dAB, dCD)
F = Intersect(dAD, dBC)
AE = Segment(A, E)
AF = Segment(A, F)
BF = Segment(B, F)
DE = Segment(D, E)
dAC = Line(A, C)
dBD = Line(B, D)
dEF = Line(E, F)
I = Intersect(dAC, dBD)
J = Intersect(dAC, dEF)
K = Intersect(dBD, dEF)
AJ = Segment(A, J)
BK = Segment(B, K)
EK = Segment(E, K)