M = Intersect(xAxis, yAxis)
c = Circle(M, 4)
P = (9.31, -6.45)
a = Segment(M, P)
h = Semicircle(M, P)
B = Intersect(h, c)
Vieleck1, p, m, b = Polygon(M, B, P)
α = Angle(M, B, P)
d = Line(B, P)