$\textbf{A}$

$\textbf{B}$

$\mathbf{C}$

A2 = (6, -5)
A1 = (1, 0)
f_a = Vector(A1, A2)
B1 = (-4, 1)
B2 = (-1, 5)
f_b = Vector(B1, B2)
C2 = (1, 2)
C1 = (5, 3)
f_c = Vector(C1, C2)
points: {A1, A2, B1, B2, C1, C2}
Z: 6