$A$

$C$

$B$

$M$

$N$

$D$

$E$

$F$

A = Point(xAxis)
B = Point(yAxis)
A' = Rotate(A, 90°, B)
α = Angle(A, B, A')
f = Segment(A, B)
g = Line(B, A')
C = Intersect(g, xAxis)
h = Segment(B, C)
i = Segment(C, A)
D = Midpoint(f)
E = Midpoint(h)
j = Line(D, E)
k = OrthogonalLine(A, j)
l = OrthogonalLine(C, j)
F = Intersect(j, k)
G = Intersect(j, l)
H = Intersect(k, l)
m = Segment(A, F)
n = Segment(C, G)
β = Angle(m, j)
γ = Angle(n, j)
p = OrthogonalLine(B, j)
I = Intersect(j, p)
q = Segment(B, I)
δ = Angle(j, q)