A = Point(xAxis)
B = Intersect(xAxis, yAxis)
c = Circle(A, B)
C = Point(c)
a = Line(A, B)
b = OrthogonalLine(A, a)
d = OrthogonalLine(C, a)
e = OrthogonalLine(C, b)
D = Intersect(b, e)
f = Segment(D, C)
E = Intersect(a, d)
g = Segment(C, E)
u = Vector(A, C)
α = Angle(B, A, C)
F: (α, sin(α))
G: (α, cos(α))
H: (α, tan(α))