Trascinare r

A = (2.64, 0.04)
B = (0.54, 1.5)
C = (1.06, -1)
poli1, c, a, b = Polygon(A, B, C)
O = (-1.2, -0.06)
r = 2.9 (slider from -5 to 5, step 0.1)
A' = Dilate(A, r, O)
B' = Dilate(B, r, O)
C' = Dilate(C, r, O)
poli1', c', a', b' = Polygon(A', B', C')