P: (1, 0)
w = 0 (slider from 0 to 360, step 1)
a = 1
O = Intersect(yAxis, xAxis)
c = Circle(O, a)
B = Rotate(P, w°, O)
S: ((w * 3.1416 / 180), y(B))
C: ((w * 3.1416 / 180), x(B))
e = OrthogonalLine(S, xAxis)
X = Intersect(e, xAxis)
b' = Segment(O, X)
t: x = 1
h = Line(O, B)
D = Intersect(h, t)
α = Angle(P, O, B)
b = CircleArc(O, P, B)
T: ((w * 3.14159 / 180), y(D))