A = (2, 3)
B = (-1, 5)
C = (3, 4)
a = Segment(B, A)
b = Segment(A, C)
c = Segment(C, B)
D = Midpoint(B, C)
d = Line(A, D)
e = Line(C, B)
πολύγ.1, c_1, b_1, a_1 = Polygon(B, A, C)
f = Line(A, B)
g = Line(A, C)