A = (5, 5)
B = (5, 3)
C = (11, 3)
t1, c, a, b = Polygon(A, B, C)
D = (1, 1)
E = (7, -3)
F = (3, -3)
t2, f, d, e = Polygon(D, E, F)
G = (11, -3)
H = (15, -3)
I = (13, 1)
t3, i, g, h = Polygon(G, H, I)
α = 0 rad (slider from 0 to 6.283185307179586)