A = (-1.22, 1)
B = (6.38, 2.96)
C = (-0.38, 4.4)
poly1, Base, a, b = Polygon(A, B, C)
d = OrthogonalLine(C, Base)
α = Angle(Base, d)
D = Intersect(d, Base)
Hauteur = Segment(D, C)