$ \vec{r} $

$ \vec{-a} $

$ \vec{n} $

$ -\vec{a} + \vec{r} = \vec{r} - \vec{a} $

A = (-0.5465173551916773, 1.8791427485726233, 1.429424117731126)
B = (-0.43769930707093496, 2.7136088145640773, 2.8964630414841115)
u = Vector(A, B)
a = PerpendicularPlane(A, u)
O = (0, 0, 0)
v = Vector(A, O)
R = PointIn(a)
w = Vector(A, R)
z = Vector(O, R)
α = Angle(R, A, B)
D = Midpoint(B, A)
E = Midpoint(O, A)
F = Midpoint(R, A)
G = Midpoint(R, O)