cos(α)

sin(α)

tan(α)

B' = (1, 0)
A = Intersect(xAxis, yAxis)
f = Ray(A, B')
O = Intersect(xAxis, yAxis)
k = Circle(O, 1)
F = Intersect(k, f, 1)
E = Intersect(k, yAxis, 2)
k_{2} = Arc(k, F, E)
C = Point(k_{2})
B: (x(C), 0)
d1, c, a, b = Polygon(A, B, C)
g = Ray(A, C)
α = Angle(B', A, C)
β = Angle(C, B, A)
h = OrthogonalLine(B', xAxis)
C' = Intersect(h, g)
i = Segment(C', B')