A = (1, 1)
C = Point(Circle[A, 5.0])
a = Segment(A, C)
b = OrthogonalLine(C, a)
c = Circle(C, 6.0)
B, D = Intersect(c, b)
d = Segment(A, B)
mnogokotnik1, c_1, a_1, b_1 = Polygon(A, B, C)
α = Angle(C, B, A)