A = (2.66, 3.16)
B = Point(xAxis)
a = Line(A, B)
b = OrthogonalLine(A, a)
C = Intersect(b, xAxis)
M = Point(xAxis)
α = Angle(a, b)
c = Segment(B, C)
poly1, a_1, b_1, c_1 = Polygon(B, C, A)
d = OrthogonalLine(M, c_1)
e = OrthogonalLine(M, b_1)
P = Intersect(d, c_1)
Q = Intersect(b_1, e)
PQ = Segment(P, Q)
β = Angle(c_1, d)
γ = Angle(b_1, e)