tangente triangle rect F

B = (0.8, 5.42)
F: (-4, 1)
F': (-8.34, 1.12)
O = Midpoint(F', F)
Δ = Line(F', F)
M_0 = (-5.64, 3.82)
c = Ellipse(F', F, M_0)
A_1, A = Intersect(c, Δ)
D_1 = (1.4, 5.86)
g = Line(F, D_1)
h = Line(A, g)
f = Line(B, O)
E = Intersect(f, g)
i = Line(E, A)
G = Intersect(h, f)
j = Line(G, i)
K = Intersect(j, Δ)
I = Intersect(g, h)
J = Intersect(i, j)
D = OrthogonalLine(K, Δ)
M = Point(c)
k = Tangent(M, c)
N = Intersect(D, k)
l = Segment(M, F)
m = Segment(N, F)
α_{1} = Angle(N, F, M)
n = Segment(F', M)
p = OrthogonalLine(M, k)
C = Point(p)
α = Angle(F', M, C)
α' = Angle(C, M, F)