RELACIONS TRIGONOMETRIQUES
entre els angles  α  i  α + 90º

A = (5, 2)
c = Circle(A, 1)
B = Point(c)
C = Point(c)
α = Angle(B, A, C)
a = Ray(A, C)
C' = Rotate(C, 90°, A)
β = Angle(C, A, C')
b = Ray(A, C')
d = Ray(A, B)
e = OrthogonalLine(C', d)
f = OrthogonalLine(A, e)
g = OrthogonalLine(C, d)
D = Intersect(e, f)
E = Intersect(g, d)
h = Segment(C', D)
i = Segment(C, E)
γ = Angle(B, A, C')