 \vec{ a }\;-\; \vec{ b }  

A_1 = (18.7622, 3.4506)
B_1 = (24.8606, 3.499)
b = Vector(A_1, B_1)
C = (20.3594, -1.0022)
D = (22.489, 3.0392)
a = Vector(C, D)
O = (25.4172, -0.5665999999999984)
a_1 = Line(O, b)
b_1 = Line(O, a)
c = Circle(O, Segment[A_1, B_1])
B = Intersect(c, a_1, 2.0)
d = Circle(O, Segment[C, D])
A = Intersect(d, b_1, 2.0)
w = Vector(O, A)
z = Vector(O, B)
e = Vector(B, A)