A = (7.654047184200474, 3.321653374326801)
B = (3.459518545560054, 7.7593430934681304)
C = (-3.8657090045293887, 3.29125823926419)
c = Circle(C, B)
d = Circle(A, B)
D = Intersect(c, d, 2.0)
đa giác1, b, c_1, d_1, a = Polygon(B, C, D, A)