A = (0, 0)
B = (5, 0)
t = 5.6 (slider from 0.5 to 10, step 0.1)
c = Circle(A, 2 * t - 1)
d = Circle(B, t + 2)
C = Intersect(c, d, 1)
poly1, AB, BC, AC = Polygon(A, B, C)
texte1: "AB=" + AB + "
AC=" + AC + "
BC=" + BC + ""