A = (-1, 2)
B = (3, 1)
C = (1, 3)
πολύγ.1, b, a, c = Polygon(A, C, B)
d = Line(A, B)
e = Line(A, C)
f = Line(C, B)
g = OrthogonalLine(A, f)
h = OrthogonalLine(C, d)
i = OrthogonalLine(B, e)
j = LineBisector(A, C)
k = LineBisector(B, C)
l = LineBisector(A, B)