O = (0, 0, 0)
c = Circle(O, 3, xOyPlane)
a, d, b = Cylinder(c, 5.049132452831861)
P' = Point(c)
e = OrthogonalLine(P', c)
P = Point(e)
f = Segment(O, P')
g = Segment(P', P)
h = Vector(O, P)
A = (3, 0, 0)
α = Angle(A, O, P')
β = Angle(P', O, P)