A = (4.12, 0.78)
B_1 = (6.54, -0.72)
c = Circle(A, B_1)
B = Point(c)
C = Point(c)
poly1, c_1, b, a = Polygon(B, A, C)

Tool: Projection
Projette un point sur l'axe
Input: A
Output: a, b

B: (x(A), 0.0)
C: (0.0, y(A))
a = Segment(A, C)
b = Segment(A, B)