a)

b)

c)

d)

A = Intersect(xAxis, yAxis)
B = Point(xAxis)
Ca = (10, 1)
f = Line(A, Ca)
Cb: (10, 2.5)
Cc: (10, 0.3)
Cd: (10, 1.2)
g = Line(A, Cb)
h = Line(A, Cc)
i = Line(A, Cd)
α = Angle(xAxis, f)
a = false
β = Angle(xAxis, g)
b = false
γ = Angle(xAxis, h)
c = false
δ = Angle(xAxis, i)
d = false