a = Vector((3, 1))
α = Angle(a)
b = Vector((1, 4))
β = Angle(b)
a1 = Point(xAxis)
a2 = Point(yAxis)
A = Point(a)
B = Point(b)
b2 = Point(yAxis)
b1 = Point(xAxis)
c = Segment(A, a1)
d = Segment(B, b1)
e = Segment(B, b2)
f = Segment(A, a2)
ϕ = Angle(a, b)
Ob2 = Segment((0, 0), b2)
Oa1 = Segment((0, 0), a1)
Ob1 = Segment((0, 0), b1)
Oa2 = Segment((0, 0), a2)