P=(r;θ)

y=r\,\sin(θ)

x=r\,\cos(θ)

P=(r\,;\theta)=(x,y)

P = (4, 3)
X: (x(P), 0)
O = (0, 0)
r = Segment(O, P)
θ = Angle(X, O, P)
A = (1.7785193224468174, 0.9133333333333358)
B = Point(r)
u = Vector(A, B)
Vieleck1, p, o, C = Polygon(O, X, P)
b = Segment(O, X)
c = Segment(P, X)