A = (1.26, 4.06)
B = (-2, -5)
C = (9, 4)
f = Line(B, C)
M = Point(f)
poly1, g, h, i, N = Polygon(A, M, 3)
I = Midpoint(A, M)
G: (A + M + N) / 3
xb: x(B)
yb: y(B)
xc: x(C)
yc: y(C)
eq1: ((x - xc) * (yb - yc)) - ((y - yc) * (xb - xc)) = 0