Couple de parallèles et sécante
Angles alternes-internes, correspondants

Attention : On peut faire varier tous les points mais :
A doit toujours rester entre A1 et B et D entre C et E.

A1 = (-2.340045351473923, 2.535839831867705)
B1 = (-2.2427056025662298, -0.3064808362369344)
Δ = Line(A1, B1)
d1 = OrthogonalLine(A1, Δ)
d2 = OrthogonalLine(B1, Δ)
A = Point(d1)
B = Point(d1)
C = Point(d2)
D = Point(d2)
c = Line(A, D)
M = Midpoint(A, D)
β = Angle(A, D, C)
E = Point(d2)
F = Point(c)
γ = Angle(F, D, E)
δ = Angle(B1, A1, A)
ε = Angle(C, B1, A1)
α = Angle(D, A, B)