A = (-1.9757215631208398, 3.3444060273001472)
B = (3.7183494411228346, 2.1221185342426025)
C = (1.14, -2)
M: A - B + C
N: A + B - C
P: -A + B + C
a = Segment(M, N)
b = Segment(N, P)
c = Segment(P, M)
d = Segment(A, B)
e = Segment(B, C)
f = Segment(C, A)