a = 0.3490658503988664 (slider from -6.283185307179586 to 6.283185307179586, step °)
A = (-12.148815610483618, 5.830443084560154)
B = (-11.375478241168027, 10.54077069766423)
C = (-4.93787598810931, 6.0368960847481565)
polígono1, c, a_1, b = Polygon(A, B, C)
O = (3.6521138191202525, 3.0982153612222505)
texto1: "a=" + (LaTeX[a / °]) + "$\circ$"
D_1 = (9.025256470963537, 5.727459153156341)
A' = Rotate(A, 40°, O)
B' = Rotate(B, 40°, O)
C' = Rotate(C, 40°, O)
polígono1', c', a', b' = Polygon(A', B', C')
D = Rotate(A', 60°, D_1)
E = Rotate(B', 60°, D_1)
F = Rotate(C', 60°, D_1)
polígono1'', c'', a'', b'' = Polygon(D, E, F)