AB = 1

AD\;=\; \sqrt{ 3 } 

A = (0.8299259558086618, 1.9761163284333687)
c = Circle(A, 1.0)
B = Point(c)
a = Segment(A, B)
b = OrthogonalLine(A, a)
d = OrthogonalLine(B, a)
e = Circle(A, 1.7320508075688772)
D = Intersect(e, b, 2.0)
f = OrthogonalLine(D, b)
C = Intersect(d, f)
đa giác1, a_1, c_1, d_1, b_1 = Polygon(A, D, C, B)
g = Segment(A, C)
h = Segment(D, B)
I = Intersect(g, h)
i = Distance(a_1, b_1)