A = Intersect(xAxis, yAxis)
c = Circle(A, 3)
H = Point(c)
f = Tangent(H, c)
B = Intersect(f, yAxis)
C = Intersect(f, xAxis)
poly1, a, b, c_1 = Polygon(B, C, A)
α = Angle(C, A, B)
g = Segment(A, H)
β = Angle(B, H, A)