1: Osservare e poi costruire fino a 17
2: Osservare e poi costruire fino a fine.

A = (-1, 0)
B = (5, 1)
C = (1, 3)
D = (-3, 1)
poly1, a, b, c, d = Polygon(A, B, C, D)
e = Line(A, C)
f = Line(B, D)
g = Line(A, f)
h = Line(B, e)
i = Line(C, f)
j = Line(D, e)
I = Intersect(g, h)
J = Intersect(h, i)
K = Intersect(i, j)
L = Intersect(g, j)
poly3, i_1, j_1, k, l = Polygon(I, J, K, L)
E = Midpoint(a)
F = Midpoint(b)
G = Midpoint(c)
H = Midpoint(d)
poly2, e_1, f_1, g_1, h_1 = Polygon(E, F, G, H)