S = (2, -1)
c = Circle(S, 3.0)
A, B = Intersect(c, a)
C, D = Intersect(c, d)
E = Intersect(e, d)
F = Intersect(a, e)
f = CircleArc(S, A, C)
mnogokotnik1, c_1, e_1, f_1, a_1 = Polygon(C, E, F, A)