A = (2, -1)
f: y = y(A)
B = (-3.6494329603851643, -4.3728875615218445)
g = OrthogonalLine(A, f)
C = Point(g)
h: y = y(C)
D = Point(h)
i = Line(A, D)
E: (x(D) - 10, y(D))
F: (x(D) + 10, y(D))
G: (x(A) - 10, y(A))
H: (x(A) + 10, y(A))
I: (x(C), y(C) + 20)
J: (x(C), y(C) - 20)
K: (x(A), y(A) + 20)
L: (x(A), y(A) - 20)
p: y = y(L)
q: y = y(K)
r: y = y(J)
s: y = y(I)
M = Intersect(i, p)
N = Intersect(i, q)
O = Intersect(i, r)
P = Intersect(i, s)
α = Angle(E, D, P)
β = Angle(E, D, O)
γ = Angle(F, D, P)
δ = Angle(F, D, O)
ε = Angle(G, A, N)
ζ = Angle(G, A, M)
η = Angle(H, A, N)
θ = Angle(H, A, M)