I numeri razionali sul piano cartesiano
Author: Ubaldo Pernigo (UbiMath)

D = Point(b)
E = Point(b)
H = Point(a)
I = Point(a)
J = Point(a)
K = Point(a)
A = Point(c)
B = Point(b)
C = Point(b)
F = Point(b)
M = Point(c)
G = Point(c)
L = Point(c)