GB+GC= 2 GA' (vecteurs)

A = (0.84, 5.14)
B = (-1.94, -0.54)
C = (5.54, -1.48)
poly1, c, a, b = Polygon(A, B, C)
d = OrthogonalLine(A, a)
e = OrthogonalLine(B, b)
h = OrthogonalLine(C, c)
A' = Midpoint(a)
B' = Midpoint(b)
C' = Midpoint(c)
f = Segment(A, A')
g = Segment(B, B')
G = Intersect(f, g)
i = Segment(C, C')