A = (-6.840355710786173, 21.312475786660276)
B = (-9.408419405863143, 14.453470221328113)
C = (0.7988211036832955, 14.90857011665821)
poly1, c, a, b = Polygon(A, B, C)
M = Midpoint(B, C)
d = Segment(A, M)
R = Point(d)
e = Line(R, c)
f = Line(R, b)
D = Intersect(e, a)
E = Intersect(f, a)