P

1

π+α

u = Vector((-2, 0), (2, 0))
v = Vector((0, -2), (0, 2))
A = (0, 0)
c = Circle(A, 1)
B = Point(c)
g = Segment((-2, 0), (2, 0))
H = Intersect(c, g, 2)
a = OrthogonalLine(H, g)
b = Line(A, B)
C = Intersect(c, b, 2)
D = Intersect(a, b)
d = Segment(C, D)
e = Segment(A, B)
f = Segment(A, C)
α = Angle(g, e)
β = Angle(g, f)
h = Segment(H, D)